21905900377092 has 60 divisors (see below), whose sum is σ = 57271511335500. Its totient is φ = 7301308762944.

The previous prime is 21905900377087. The next prime is 21905900377099. The reversal of 21905900377092 is 29077300950912.

21905900377092 is a `hidden beast` number, since 2 + 19 + 0 + 590 + 0 + 37 + 7 + 0 + 9 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6279564880836 + 15626335496256 = 2505906^2 + 3953016^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (21905900377099) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 561034 + ... + 6642782.

It is an arithmetic number, because the mean of its divisors is an integer number (954525188925).

Almost surely, 2^{21905900377092} is an apocalyptic number.

It is an amenable number.

21905900377092 is an abundant number, since it is smaller than the sum of its proper divisors (35365610958408).

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

21905900377092 is a wasteful number, since it uses less digits than its factorization.

21905900377092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6092882 (or 6092871 counting only the distinct ones).

The product of its (nonzero) digits is 2143260, while the sum is 54.

The spelling of 21905900377092 in words is "twenty-one trillion, nine hundred five billion, nine hundred million, three hundred seventy-seven thousand, ninety-two".