21022155618792 has 32 divisors (see below), whose sum is σ = 53275325887680. Its totient is φ = 6911393627520.

The previous prime is 21022155618791. The next prime is 21022155618829. The reversal of 21022155618792 is 29781655122012.

It is not an unprimeable number, because it can be changed into a prime (21022155618791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5999471884 + ... + 5999475387.

It is an arithmetic number, because the mean of its divisors is an integer number (1664853933990).

Almost surely, 2^{21022155618792} is an apocalyptic number.

It is an amenable number.

21022155618792 is an abundant number, since it is smaller than the sum of its proper divisors (32253170268888).

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

21022155618792 is a wasteful number, since it uses less digits than its factorization.

21022155618792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11998947353 (or 11998947349 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 51.

The spelling of 21022155618792 in words is "twenty-one trillion, twenty-two billion, one hundred fifty-five million, six hundred eighteen thousand, seven hundred ninety-two".