21374267160520 has 16 divisors (see below), whose sum is σ = 48092101111260. Its totient is φ = 8549706864192.

The previous prime is 21374267160517. The next prime is 21374267160527. The reversal of 21374267160520 is 2506176247312.

It can be written as a sum of positive squares in 2 ways, for example, as 21309985643076 + 64281517444 = 4616274^2 + 253538^2 .

It is not an unprimeable number, because it can be changed into a prime (21374267160527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267178339467 + ... + 267178339546.

Almost surely, 2^{21374267160520} is an apocalyptic number.

21374267160520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21374267160520 is an abundant number, since it is smaller than the sum of its proper divisors (26717833950740).

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

21374267160520 is a wasteful number, since it uses less digits than its factorization.

21374267160520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534356679024 (or 534356679020 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 21374267160520 in words is "twenty-one trillion, three hundred seventy-four billion, two hundred sixty-seven million, one hundred sixty thousand, five hundred twenty".