21259862504 has 48 divisors (see below), whose sum is σ = 41888256900. Its totient is φ = 10114689024.

The previous prime is 21259862497. The next prime is 21259862521. The reversal of 21259862504 is 40526895212.

It can be written as a sum of positive squares in 2 ways, for example, as 17611944100 + 3647918404 = 132710^2 + 60398^2 .

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 11 ways as a sum of consecutive naturals, for example, 803762 + ... + 829790.

Almost surely, 2^21259862504 is an apocalyptic number.

It is an amenable number.

21259862504 is a deficient number, since it is larger than the sum of its proper divisors (20628394396).

21259862504 is a wasteful number, since it uses less digits than its factorization.

21259862504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26274 (or 26247 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 21259862504 in words is "twenty-one billion, two hundred fifty-nine million, eight hundred sixty-two thousand, five hundred four".