21939015158 has 16 divisors (see below), whose sum is σ = 33257425824. Its totient is φ = 10853272320.

The previous prime is 21939015157. The next prime is 21939015167. The reversal of 21939015158 is 85151093912.

It is a super-2 number, since 2×21939015158² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21939015157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745463 + ... + 774333.

It is an arithmetic number, because the mean of its divisors is an integer number (2078589114).

Almost surely, 2^21939015158 is an apocalyptic number.

21939015158 is a deficient number, since it is larger than the sum of its proper divisors (11318410666).

21939015158 is a wasteful number, since it uses less digits than its factorization.

21939015158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32887.

The product of its (nonzero) digits is 97200, while the sum is 44.

The spelling of 21939015158 in words is "twenty-one billion, nine hundred thirty-nine million, fifteen thousand, one hundred fifty-eight".