21372092016016 has 135 divisors (see below), whose sum is σ = 49384759737537. Its totient is φ = 8933847310080.

The previous prime is 21372092015999. The next prime is 21372092016053. The reversal of 21372092016016 is 61061029027312.

It is a happy number.

The square root of 21372092016016 is 4622996.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1029827158416 + 20342264857600 = 1014804^2 + 4510240^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21372092016016.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5307197395 + ... + 5307201421.

Almost surely, 2^{21372092016016} is an apocalyptic number.

21372092016016 is the 4622996-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21372092016016

21372092016016 is an abundant number, since it is smaller than the sum of its proper divisors (28012667721521).

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

21372092016016 is an frugal number, since it uses more digits than its factorization.

21372092016016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8158 (or 4077 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 21372092016016 in words is "twenty-one trillion, three hundred seventy-two billion, ninety-two million, sixteen thousand, sixteen".