22512135621 has 4 divisors (see below), whose sum is σ = 30016180832. Its totient is φ = 15008090412.

The previous prime is 22512135599. The next prime is 22512135629. The reversal of 22512135621 is 12653121522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22512135621 - 2¹⁰ = 22512134597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22512135629) 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, 3752022601 + ... + 3752022606.

It is an arithmetic number, because the mean of its divisors is an integer number (7504045208).

Almost surely, 2^22512135621 is an apocalyptic number.

It is an amenable number.

22512135621 is a deficient number, since it is larger than the sum of its proper divisors (7504045211).

22512135621 is an equidigital number, since it uses as much as digits as its factorization.

22512135621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7504045210.

The product of its digits is 7200, while the sum is 30.

The spelling of 22512135621 in words is "twenty-two billion, five hundred twelve million, one hundred thirty-five thousand, six hundred twenty-one".