21919768916388 has 24 divisors (see below), whose sum is σ = 58452717110592. Its totient is φ = 6262791118944.

The previous prime is 21919768916321. The next prime is 21919768916399. The reversal of 21919768916388 is 88361986791912.

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, 130474814895 + ... + 130474815062.

It is an arithmetic number, because the mean of its divisors is an integer number (2435529879608).

Almost surely, 2^{21919768916388} is an apocalyptic number.

21919768916388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21919768916388 is an abundant number, since it is smaller than the sum of its proper divisors (36532948194204).

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

21919768916388 is a wasteful number, since it uses less digits than its factorization.

21919768916388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260949629971 (or 260949629969 counting only the distinct ones).

The product of its digits is 564350976, while the sum is 78.

The spelling of 21919768916388 in words is "twenty-one trillion, nine hundred nineteen billion, seven hundred sixty-eight million, nine hundred sixteen thousand, three hundred eighty-eight".