Millions of Social Security recipients are set to receive their next monthly retirement checks, which are worth up to $4,555 per payment, in two days.

Social Security beneficiaries who were born between the 21st and the 31st of a month are set to receive their retirement payments on Wednesday. Those who have birth dates between the first and 20th of a month have already received their monthly checks for April.

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These Social Security payments vary based on the age at which a person retired. Those who retired at the current retirement age of 67 receive a maximum check of $3,627, and those who retired at 62 get up to $2,572. Those who delay their retirement to age 70 get the largest payment of $4,555 per month, per the Social Security Administration.

The monthly retirement checks are paid out in three waves — always on a Wednesday. The waves of payments are divided by the birthdays of the recipients.

The first wave of checks is always sent out on the second Wednesday of the month to those born between the first and 10th of their birth months. This month's payment was sent to that group on April 12. The second wave of payments was sent out on the third Wednesday of this month, April 19, and it went to those born between the 11th and the 21st of their birth months, per the SSA.

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Regular Social Security checks differ from other payments distributed by the agency, such as disability insurance or Supplemental Security Income. SSI payments are set to be paid out to eligible recipients on May 1.

Analysts predict that Social Security's insolvency may occur as early as 2034 unless action is taken by Congress to prevent it.