21112523224 has 16 divisors (see below), whose sum is σ = 42631056720. Its totient is φ = 9744241440.

The previous prime is 21112523221. The next prime is 21112523251. The reversal of 21112523224 is 42232521112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112523221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101502412 + ... + 101502619.

It is an arithmetic number, because the mean of its divisors is an integer number (2664441045).

Almost surely, 2^21112523224 is an apocalyptic number.

It is an amenable number.

21112523224 is an abundant number, since it is smaller than the sum of its proper divisors (21518533496).

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

21112523224 is a wasteful number, since it uses less digits than its factorization.

21112523224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203005050 (or 203005046 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The spelling of 21112523224 in words is "twenty-one billion, one hundred twelve million, five hundred twenty-three thousand, two hundred twenty-four".