21261033156512 has 24 divisors (see below), whose sum is σ = 41860385280000. Its totient is φ = 10629824196544.

The previous prime is 21261033156497. The next prime is 21261033156529. The reversal of 21261033156512 is 21565133016212.

It is a super-2 number, since 2×21261033156512² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21137762 + ... + 22120737.

It is an arithmetic number, because the mean of its divisors is an integer number (1744182720000).

Almost surely, 2^{21261033156512} is an apocalyptic number.

It is an amenable number.

21261033156512 is a deficient number, since it is larger than the sum of its proper divisors (20599352123488).

21261033156512 is a wasteful number, since it uses less digits than its factorization.

21261033156512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43273868 (or 43273860 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 21261033156512 in words is "twenty-one trillion, two hundred sixty-one billion, thirty-three million, one hundred fifty-six thousand, five hundred twelve".