21725351076123 has 16 divisors (see below), whose sum is σ = 32187048614560. Its totient is φ = 14482962891648.

The previous prime is 21725351076097. The next prime is 21725351076131. The reversal of 21725351076123 is 32167015352712.

21725351076123 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 5 + 3 + 510 + 7 + 6 + 123 = 666.

It is not a de Polignac number, because 21725351076123 - 2²⁰ = 21725350027547 is a prime.

It is a super-2 number, since 2×21725351076123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21725351076523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16132090 + ... + 17426847.

It is an arithmetic number, because the mean of its divisors is an integer number (2011690538410).

Almost surely, 2^{21725351076123} is an apocalyptic number.

21725351076123 is a deficient number, since it is larger than the sum of its proper divisors (10461697538437).

21725351076123 is a wasteful number, since it uses less digits than its factorization.

21725351076123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33582923 (or 33582917 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The spelling of 21725351076123 in words is "twenty-one trillion, seven hundred twenty-five billion, three hundred fifty-one million, seventy-six thousand, one hundred twenty-three".