22440523621 has 2 divisors, whose sum is σ = 22440523622. Its totient is φ = 22440523620.

The previous prime is 22440523613. The next prime is 22440523639. The reversal of 22440523621 is 12632504422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12150652900 + 10289870721 = 110230^2 + 101439^2 .

It is a cyclic number.

It is not a de Polignac number, because 22440523621 - 2³ = 22440523613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22440523121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11220261810 + 11220261811.

It is an arithmetic number, because the mean of its divisors is an integer number (11220261811).

Almost surely, 2^22440523621 is an apocalyptic number.

It is an amenable number.

22440523621 is a deficient number, since it is larger than the sum of its proper divisors (1).

22440523621 is an equidigital number, since it uses as much as digits as its factorization.

22440523621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 31.

The spelling of 22440523621 in words is "twenty-two billion, four hundred forty million, five hundred twenty-three thousand, six hundred twenty-one".