21261455371232 has 48 divisors (see below), whose sum is σ = 43226213127552. Its totient is φ = 10283646466560.

The previous prime is 21261455371207. The next prime is 21261455371279. The reversal of 21261455371232 is 23217355416212.

It is a happy number.

It is a congruent number.

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, 1869203 + ... + 6783570.

It is an arithmetic number, because the mean of its divisors is an integer number (900546106824).

Almost surely, 2^{21261455371232} is an apocalyptic number.

It is an amenable number.

21261455371232 is an abundant number, since it is smaller than the sum of its proper divisors (21964757756320).

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

21261455371232 is a wasteful number, since it uses less digits than its factorization.

21261455371232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8655291 (or 8655283 counting only the distinct ones).

The product of its digits is 604800, while the sum is 44.

The spelling of 21261455371232 in words is "twenty-one trillion, two hundred sixty-one billion, four hundred fifty-five million, three hundred seventy-one thousand, two hundred thirty-two".