21150012156556 has 12 divisors (see below), whose sum is σ = 37378981881360. Its totient is φ = 10470303047600.

The previous prime is 21150012156547. The next prime is 21150012156557. The reversal of 21150012156556 is 65565121005112.

It is a super-2 number, since 2×21150012156556² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21150012156557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26175757216 + ... + 26175758023.

It is an arithmetic number, because the mean of its divisors is an integer number (3114915156780).

Almost surely, 2^{21150012156556} is an apocalyptic number.

It is an amenable number.

21150012156556 is a deficient number, since it is larger than the sum of its proper divisors (16228969724804).

21150012156556 is a wasteful number, since it uses less digits than its factorization.

21150012156556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52351515344 (or 52351515342 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 40.

The spelling of 21150012156556 in words is "twenty-one trillion, one hundred fifty billion, twelve million, one hundred fifty-six thousand, five hundred fifty-six".