22521131220 has 48 divisors (see below), whose sum is σ = 72067621248. Its totient is φ = 5147687040.

The previous prime is 22521131219. The next prime is 22521131221. The reversal of 22521131220 is 2213112522.

It is an interprime number because it is at equal distance from previous prime (22521131219) and next prime (22521131221).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22521131221) 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, 26810451 + ... + 26811290.

It is an arithmetic number, because the mean of its divisors is an integer number (1501408776).

Almost surely, 2^22521131220 is an apocalyptic number.

22521131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22521131220 is an abundant number, since it is smaller than the sum of its proper divisors (49546490028).

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

22521131220 is a wasteful number, since it uses less digits than its factorization.

22521131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53621760 (or 53621758 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 22521131220 its reverse (2213112522), we get a palindrome (24734243742).

The spelling of 22521131220 in words is "twenty-two billion, five hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty".