22521254220 has 72 divisors (see below), whose sum is σ = 72332979264. Its totient is φ = 5652392448.

The previous prime is 22521254219. The next prime is 22521254227. The reversal of 22521254220 is 2245212522.

It is a happy number.

22521254220 is a `hidden beast` number, since 2 + 25 + 212 + 5 + 422 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (22521254227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3676884 + ... + 3683003.

It is an arithmetic number, because the mean of its divisors is an integer number (1004624712).

Almost surely, 2^22521254220 is an apocalyptic number.

22521254220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22521254220 is an abundant number, since it is smaller than the sum of its proper divisors (49811725044).

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

22521254220 is a wasteful number, since it uses less digits than its factorization.

22521254220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7359919 (or 7359914 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 22521254220 its reverse (2245212522), we get a palindrome (24766466742).

The spelling of 22521254220 in words is "twenty-two billion, five hundred twenty-one million, two hundred fifty-four thousand, two hundred twenty".