21310243994 has 16 divisors (see below), whose sum is σ = 34472148480. Its totient is φ = 9821809200.

The previous prime is 21310243961. The next prime is 21310244047. The reversal of 21310243994 is 49934201312.

21310243994 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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, 551282 + ... + 588669.

It is an arithmetic number, because the mean of its divisors is an integer number (2154509280).

Almost surely, 2^21310243994 is an apocalyptic number.

21310243994 is a deficient number, since it is larger than the sum of its proper divisors (13161904486).

21310243994 is a wasteful number, since it uses less digits than its factorization.

21310243994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140685.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 21310243994 in words is "twenty-one billion, three hundred ten million, two hundred forty-three thousand, nine hundred ninety-four".