21256043025213 has 12 divisors (see below), whose sum is σ = 31356432264768. Its totient is φ = 13869191193480.

The previous prime is 21256043025181. The next prime is 21256043025221. The reversal of 21256043025213 is 31252034065212.

21256043025213 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 6 + 0 + 430 + 2 + 5 + 213 = 666.

It is not a de Polignac number, because 21256043025213 - 2⁵ = 21256043025181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256043025233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25125345943 + ... + 25125346788.

It is an arithmetic number, because the mean of its divisors is an integer number (2613036022064).

Almost surely, 2^{21256043025213} is an apocalyptic number.

It is an amenable number.

21256043025213 is a deficient number, since it is larger than the sum of its proper divisors (10100389239555).

21256043025213 is a wasteful number, since it uses less digits than its factorization.

21256043025213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50250692784 (or 50250692781 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 21256043025213 in words is "twenty-one trillion, two hundred fifty-six billion, forty-three million, twenty-five thousand, two hundred thirteen".