21355433815188 has 48 divisors (see below), whose sum is σ = 54403230942144. Its totient is φ = 6466112048640.

The previous prime is 21355433815153. The next prime is 21355433815207. The reversal of 21355433815188 is 88151833455312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65230245 + ... + 65556812.

It is an arithmetic number, because the mean of its divisors is an integer number (1133400644628).

Almost surely, 2^{21355433815188} is an apocalyptic number.

It is an amenable number.

21355433815188 is an abundant number, since it is smaller than the sum of its proper divisors (33047797126956).

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

21355433815188 is a wasteful number, since it uses less digits than its factorization.

21355433815188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130788312 (or 130788310 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 57.

The spelling of 21355433815188 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred thirty-three million, eight hundred fifteen thousand, one hundred eighty-eight".