22518621812 has 12 divisors (see below), whose sum is σ = 39635378916. Its totient is φ = 11194227840.

The previous prime is 22518621809. The next prime is 22518621833. The reversal of 22518621812 is 21812681522.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13734433636 + 8784188176 = 117194^2 + 93724^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 16269989 + ... + 16271372.

It is an arithmetic number, because the mean of its divisors is an integer number (3302948243).

Almost surely, 2^22518621812 is an apocalyptic number.

It is an amenable number.

22518621812 is a deficient number, since it is larger than the sum of its proper divisors (17116757104).

22518621812 is a wasteful number, since it uses less digits than its factorization.

22518621812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32541538 (or 32541536 counting only the distinct ones).

The product of its digits is 30720, while the sum is 38.

The spelling of 22518621812 in words is "twenty-two billion, five hundred eighteen million, six hundred twenty-one thousand, eight hundred twelve".