21375552045321 has 12 divisors (see below), whose sum is σ = 30878221286640. Its totient is φ = 14249249312760.

The previous prime is 21375552045283. The next prime is 21375552045389. The reversal of 21375552045321 is 12354025557312.

21375552045321 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 55 + 520 + 4 + 53 + 21 = 666.

It is not a de Polignac number, because 21375552045321 - 2²³ = 21375543656713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21375552045391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93105435 + ... + 93334736.

It is an arithmetic number, because the mean of its divisors is an integer number (2573185107220).

Almost surely, 2^{21375552045321} is an apocalyptic number.

It is an amenable number.

21375552045321 is a deficient number, since it is larger than the sum of its proper divisors (9502669241319).

21375552045321 is a wasteful number, since it uses less digits than its factorization.

21375552045321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186452916 (or 186452913 counting only the distinct ones).

The product of its (nonzero) digits is 1260000, while the sum is 45.

The spelling of 21375552045321 in words is "twenty-one trillion, three hundred seventy-five billion, five hundred fifty-two million, forty-five thousand, three hundred twenty-one".