21312794118 has 64 divisors (see below), whose sum is σ = 54228211200. Its totient is φ = 5535784800.

The previous prime is 21312794101. The next prime is 21312794137. The reversal of 21312794118 is 81149721312.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 448093 + ... + 493368.

It is an arithmetic number, because the mean of its divisors is an integer number (847315800).

Almost surely, 2^21312794118 is an apocalyptic number.

21312794118 is an abundant number, since it is smaller than the sum of its proper divisors (32915417082).

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

21312794118 is a wasteful number, since it uses less digits than its factorization.

21312794118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941498 (or 941484 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The spelling of 21312794118 in words is "twenty-one billion, three hundred twelve million, seven hundred ninety-four thousand, one hundred eighteen".