21256044565026 has 16 divisors (see below), whose sum is σ = 42514025192928. Its totient is φ = 7085025511200.

The previous prime is 21256044564977. The next prime is 21256044565051. The reversal of 21256044565026 is 62056544065212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80526540 + ... + 80790071.

It is an arithmetic number, because the mean of its divisors is an integer number (2657126574558).

Almost surely, 2^{21256044565026} is an apocalyptic number.

21256044565026 is an abundant number, since it is smaller than the sum of its proper divisors (21257980627902).

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

21256044565026 is a wasteful number, since it uses less digits than its factorization.

21256044565026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161338577.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 21256044565026 in words is "twenty-one trillion, two hundred fifty-six billion, forty-four million, five hundred sixty-five thousand, twenty-six".