21631500237725 has 36 divisors (see below), whose sum is σ = 31318329734100. Its totient is φ = 14777887138560.

The previous prime is 21631500237713. The next prime is 21631500237779. The reversal of 21631500237725 is 52773200513612.

It can be written as a sum of positive squares in 6 ways, for example, as 83586904996 + 21547913332729 = 289114^2 + 4641973^2 .

It is not a de Polignac number, because 21631500237725 - 2¹⁴ = 21631500221341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 32492720 + ... + 33151769.

It is an arithmetic number, because the mean of its divisors is an integer number (869953603725).

Almost surely, 2^{21631500237725} is an apocalyptic number.

21631500237725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21631500237725 is a deficient number, since it is larger than the sum of its proper divisors (9686829496375).

21631500237725 is a wasteful number, since it uses less digits than its factorization.

21631500237725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65644782 (or 65644770 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 21631500237725 in words is "twenty-one trillion, six hundred thirty-one billion, five hundred million, two hundred thirty-seven thousand, seven hundred twenty-five".