22121521544 has 16 divisors (see below), whose sum is σ = 41865498000. Its totient is φ = 10957388752.

The previous prime is 22121521529. The next prime is 22121521561. The reversal of 22121521544 is 44512512122.

It is a super-2 number, since 2×22121521544² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12920594 + ... + 12922305.

It is an arithmetic number, because the mean of its divisors is an integer number (2616593625).

Almost surely, 2^22121521544 is an apocalyptic number.

It is an amenable number.

22121521544 is a deficient number, since it is larger than the sum of its proper divisors (19743976456).

22121521544 is a wasteful number, since it uses less digits than its factorization.

22121521544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25843012 (or 25843008 counting only the distinct ones).

The product of its digits is 6400, while the sum is 29.

The spelling of 22121521544 in words is "twenty-two billion, one hundred twenty-one million, five hundred twenty-one thousand, five hundred forty-four".