22244412521 has 4 divisors (see below), whose sum is σ = 22249129044. Its totient is φ = 22239696000.

The previous prime is 22244412481. The next prime is 22244412523. The reversal of 22244412521 is 12521444222.

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 9606156121 + 12638256400 = 98011^2 + 112420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22244412521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22244412523) 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, 2351180 + ... + 2360621.

It is an arithmetic number, because the mean of its divisors is an integer number (5562282261).

Almost surely, 2^22244412521 is an apocalyptic number.

It is an amenable number.

22244412521 is a deficient number, since it is larger than the sum of its proper divisors (4716523).

22244412521 is an equidigital number, since it uses as much as digits as its factorization.

22244412521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4716522.

The product of its digits is 10240, while the sum is 29.

Adding to 22244412521 its reverse (12521444222), we get a palindrome (34765856743).

The spelling of 22244412521 in words is "twenty-two billion, two hundred forty-four million, four hundred twelve thousand, five hundred twenty-one".