21125250522 has 40 divisors (see below), whose sum is σ = 47397727476. Its totient is φ = 7032598848.

The previous prime is 21125250493. The next prime is 21125250541. The reversal of 21125250522 is 22505252112.

It is a happy number.

21125250522 is a `hidden beast` number, since 2 + 112 + 5 + 25 + 0 + 522 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20707497801 + 417752721 = 143901^2 + 20439^2 .

It is a super-2 number, since 2×21125250522² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40878 + ... + 209574.

Almost surely, 2^21125250522 is an apocalyptic number.

21125250522 is an abundant number, since it is smaller than the sum of its proper divisors (26272476954).

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

21125250522 is a wasteful number, since it uses less digits than its factorization.

21125250522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169484 (or 169475 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The spelling of 21125250522 in words is "twenty-one billion, one hundred twenty-five million, two hundred fifty thousand, five hundred twenty-two".