22544907521 has 4 divisors (see below), whose sum is σ = 22545653844. Its totient is φ = 22544161200.

The previous prime is 22544907499. The next prime is 22544907547. The reversal of 22544907521 is 12570944522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1351371121 + 21193536400 = 36761^2 + 145580^2 .

It is a cyclic number.

It is not a de Polignac number, because 22544907521 - 2⁶ = 22544907457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22544907551) 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, 325850 + ... + 388931.

It is an arithmetic number, because the mean of its divisors is an integer number (5636413461).

Almost surely, 2^22544907521 is an apocalyptic number.

It is an amenable number.

22544907521 is a deficient number, since it is larger than the sum of its proper divisors (746323).

22544907521 is an equidigital number, since it uses as much as digits as its factorization.

22544907521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746322.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 22544907521 in words is "twenty-two billion, five hundred forty-four million, nine hundred seven thousand, five hundred twenty-one".