21372774728202 has 24 divisors (see below), whose sum is σ = 46329594267684. Its totient is φ = 7120886598144.

The previous prime is 21372774728191. The next prime is 21372774728267. The reversal of 21372774728202 is 20282747727312.

21372774728202 is a `hidden beast` number, since 2 + 1 + 372 + 7 + 7 + 47 + 28 + 202 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17020006031961 + 4352768696241 = 4125531^2 + 2086329^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 280931293 + ... + 281007360.

Almost surely, 2^{21372774728202} is an apocalyptic number.

21372774728202 is an abundant number, since it is smaller than the sum of its proper divisors (24956819539482).

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

21372774728202 is a wasteful number, since it uses less digits than its factorization.

21372774728202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561940774 (or 561940771 counting only the distinct ones).

The product of its (nonzero) digits is 7375872, while the sum is 54.

The spelling of 21372774728202 in words is "twenty-one trillion, three hundred seventy-two billion, seven hundred seventy-four million, seven hundred twenty-eight thousand, two hundred two".