21256043025152 has 36 divisors (see below), whose sum is σ = 45692828072640. Its totient is φ = 9810481394688.

The previous prime is 21256043024947. The next prime is 21256043025181. The reversal of 21256043025152 is 25152034065212.

It is a super-2 number, since 2×21256043025152² (a number of 27 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 3193512752 + ... + 3193519407.

It is an arithmetic number, because the mean of its divisors is an integer number (1269245224240).

Almost surely, 2^{21256043025152} is an apocalyptic number.

It is an amenable number.

21256043025152 is an abundant number, since it is smaller than the sum of its proper divisors (24436785047488).

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

21256043025152 is an equidigital number, since it uses as much as digits as its factorization.

21256043025152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6387032188 (or 6387032174 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 21256043025152 in words is "twenty-one trillion, two hundred fifty-six billion, forty-three million, twenty-five thousand, one hundred fifty-two".