21031725460 has 12 divisors (see below), whose sum is σ = 44166623508. Its totient is φ = 8412690176.

The previous prime is 21031725437. The next prime is 21031725493. The reversal of 21031725460 is 6452713012.

It can be written as a sum of positive squares in 2 ways, for example, as 12053404944 + 8978320516 = 109788^2 + 94754^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525793117 + ... + 525793156.

It is an arithmetic number, because the mean of its divisors is an integer number (3680551959).

Almost surely, 2^21031725460 is an apocalyptic number.

21031725460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031725460 is an abundant number, since it is smaller than the sum of its proper divisors (23134898048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031725460 is a wasteful number, since it uses less digits than its factorization.

21031725460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051586282 (or 1051586280 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 21031725460 in words is "twenty-one billion, thirty-one million, seven hundred twenty-five thousand, four hundred sixty".