21370791232218 has 16 divisors (see below), whose sum is σ = 42742923843456. Its totient is φ = 7123373514240.

The previous prime is 21370791232159. The next prime is 21370791232249. The reversal of 21370791232218 is 81223219707312.

It is a happy 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, 55683618 + ... + 56066093.

It is an arithmetic number, because the mean of its divisors is an integer number (2671432740216).

Almost surely, 2^{21370791232218} is an apocalyptic number.

21370791232218 is an abundant number, since it is smaller than the sum of its proper divisors (21372132611238).

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

21370791232218 is a wasteful number, since it uses less digits than its factorization.

21370791232218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111781589.

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 21370791232218 in words is "twenty-one trillion, three hundred seventy billion, seven hundred ninety-one million, two hundred thirty-two thousand, two hundred eighteen".