21420767718888 has 16 divisors (see below), whose sum is σ = 53551919297280. Its totient is φ = 7140255906288.

The previous prime is 21420767718869. The next prime is 21420767718941. The reversal of 21420767718888 is 88881776702412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446265994120 + ... + 446265994167.

It is an arithmetic number, because the mean of its divisors is an integer number (3346994956080).

Almost surely, 2^{21420767718888} is an apocalyptic number.

It is an amenable number.

21420767718888 is an abundant number, since it is smaller than the sum of its proper divisors (32131151578392).

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

21420767718888 is a wasteful number, since it uses less digits than its factorization.

21420767718888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892531988296 (or 892531988292 counting only the distinct ones).

The product of its (nonzero) digits is 134873088, while the sum is 69.

The spelling of 21420767718888 in words is "twenty-one trillion, four hundred twenty billion, seven hundred sixty-seven million, seven hundred eighteen thousand, eight hundred eighty-eight".