21293355870 has 32 divisors (see below), whose sum is σ = 56782283040. Its totient is φ = 5678228160.

The previous prime is 21293355791. The next prime is 21293355893. The reversal of 21293355870 is 7855339212.

21293355870 is a `hidden beast` number, since 2 + 1 + 2 + 93 + 3 + 558 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 39431871 + ... + 39432410.

It is an arithmetic number, because the mean of its divisors is an integer number (1774446345).

Almost surely, 2^21293355870 is an apocalyptic number.

21293355870 is an abundant number, since it is smaller than the sum of its proper divisors (35488927170).

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

21293355870 is a wasteful number, since it uses less digits than its factorization.

21293355870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78864297 (or 78864291 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 21293355870 in words is "twenty-one billion, two hundred ninety-three million, three hundred fifty-five thousand, eight hundred seventy".