20054172525921 has 12 divisors (see below), whose sum is σ = 29966004924180. Its totient is φ = 12908432890080.

The previous prime is 20054172525901. The next prime is 20054172525973. The reversal of 20054172525921 is 12952527145002.

It is a happy number.

20054172525921 is a `hidden beast` number, since 2 + 0 + 0 + 5 + 4 + 1 + 7 + 2 + 52 + 592 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15638979798225 + 4415192727696 = 3954615^2 + 2101236^2 .

It is not a de Polignac number, because 20054172525921 - 2²⁷ = 20054038308193 is a prime.

It is a super-2 number, since 2×20054172525921² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20054172525901) 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, 38417954770 + ... + 38417955291.

It is an arithmetic number, because the mean of its divisors is an integer number (2497167077015).

Almost surely, 2^{20054172525921} is an apocalyptic number.

It is an amenable number.

20054172525921 is a deficient number, since it is larger than the sum of its proper divisors (9911832398259).

20054172525921 is a wasteful number, since it uses less digits than its factorization.

20054172525921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76835910096 (or 76835910093 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 20054172525921 in words is "twenty trillion, fifty-four billion, one hundred seventy-two million, five hundred twenty-five thousand, nine hundred twenty-one".