21256044565030 has 32 divisors (see below), whose sum is σ = 41750240751648. Its totient is φ = 7727415436800.

The previous prime is 21256044564977. The next prime is 21256044565051. The reversal of 21256044565030 is 3056544065212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25275837 + ... + 26103256.

It is an arithmetic number, because the mean of its divisors is an integer number (1304695023489).

Almost surely, 2^{21256044565030} is an apocalyptic number.

21256044565030 is a deficient number, since it is larger than the sum of its proper divisors (20494196186618).

21256044565030 is a wasteful number, since it uses less digits than its factorization.

21256044565030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51382872.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 21256044565030 in words is "twenty-one trillion, two hundred fifty-six billion, forty-four million, five hundred sixty-five thousand, thirty".