21725772562 has 32 divisors (see below), whose sum is σ = 35446349232. Its totient is φ = 9927235584.

The previous prime is 21725772553. The next prime is 21725772571. The reversal of 21725772562 is 26527752712.

It is an interprime number because it is at equal distance from previous prime (21725772553) and next prime (21725772571).

It can be written as a sum of positive squares in 8 ways, for example, as 7659575361 + 14066197201 = 87519^2 + 118601^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2925478 + ... + 2932894.

Almost surely, 2^21725772562 is an apocalyptic number.

21725772562 is a deficient number, since it is larger than the sum of its proper divisors (13720576670).

21725772562 is a wasteful number, since it uses less digits than its factorization.

21725772562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8542.

The product of its digits is 823200, while the sum is 46.

The spelling of 21725772562 in words is "twenty-one billion, seven hundred twenty-five million, seven hundred seventy-two thousand, five hundred sixty-two".