21355466374764 has 18 divisors (see below), whose sum is σ = 53981873336300. Its totient is φ = 7118488791576.

The previous prime is 21355466374727. The next prime is 21355466374769. The reversal of 21355466374764 is 46747366455312.

21355466374764 is a `hidden beast` number, since 2 + 1 + 3 + 554 + 6 + 6 + 3 + 7 + 4 + 76 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (21355466374769) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 296603699614 + ... + 296603699685.

Almost surely, 2^{21355466374764} is an apocalyptic number.

It is an amenable number.

21355466374764 is an abundant number, since it is smaller than the sum of its proper divisors (32626406961536).

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

21355466374764 is a wasteful number, since it uses less digits than its factorization.

21355466374764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593207399309 (or 593207399304 counting only the distinct ones).

The product of its digits is 304819200, while the sum is 63.

The spelling of 21355466374764 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred sixty-six million, three hundred seventy-four thousand, seven hundred sixty-four".