21395558934 has 48 divisors (see below), whose sum is σ = 47471424000. Its totient is φ = 6960664368.

The previous prime is 21395558929. The next prime is 21395558959. The reversal of 21395558934 is 43985559312.

21395558934 is a `hidden beast` number, since 2 + 1 + 3 + 9 + 55 + 589 + 3 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1072947 + ... + 1092705.

It is an arithmetic number, because the mean of its divisors is an integer number (988988000).

Almost surely, 2^21395558934 is an apocalyptic number.

21395558934 is an abundant number, since it is smaller than the sum of its proper divisors (26075865066).

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

21395558934 is a wasteful number, since it uses less digits than its factorization.

21395558934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21209 (or 21206 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 54.

The spelling of 21395558934 in words is "twenty-one billion, three hundred ninety-five million, five hundred fifty-eight thousand, nine hundred thirty-four".