21572948036 has 6 divisors (see below), whose sum is σ = 37752659070. Its totient is φ = 10786474016.

The previous prime is 21572948029. The next prime is 21572948041. The reversal of 21572948036 is 63084927512.

It can be written as a sum of positive squares in only one way, i.e., 12433588036 + 9139360000 = 111506^2 + 95600^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2696618501 + ... + 2696618508.

It is an arithmetic number, because the mean of its divisors is an integer number (6292109845).

It is a 2-persistent number, because it is pandigital, and so is 2⋅21572948036 = 43145896072, but 3⋅21572948036 = 64718844108 is not.

Almost surely, 2^21572948036 is an apocalyptic number.

It is an amenable number.

21572948036 is a deficient number, since it is larger than the sum of its proper divisors (16179711034).

21572948036 is a wasteful number, since it uses less digits than its factorization.

21572948036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393237013 (or 5393237011 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 21572948036 in words is "twenty-one billion, five hundred seventy-two million, nine hundred forty-eight thousand, thirty-six".