22539935721 has 4 divisors (see below), whose sum is σ = 30053247632. Its totient is φ = 15026623812.

The previous prime is 22539935713. The next prime is 22539935837. The reversal of 22539935721 is 12753993522.

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 22539935721 - 2³ = 22539935713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22539935701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3756655951 + ... + 3756655956.

It is an arithmetic number, because the mean of its divisors is an integer number (7513311908).

Almost surely, 2^22539935721 is an apocalyptic number.

It is an amenable number.

22539935721 is a deficient number, since it is larger than the sum of its proper divisors (7513311911).

22539935721 is an equidigital number, since it uses as much as digits as its factorization.

22539935721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7513311910.

The product of its digits is 1020600, while the sum is 48.

The spelling of 22539935721 in words is "twenty-two billion, five hundred thirty-nine million, nine hundred thirty-five thousand, seven hundred twenty-one".