22544400421 has 4 divisors (see below), whose sum is σ = 22608265932. Its totient is φ = 22480534912.

The previous prime is 22544400377. The next prime is 22544400427. The reversal of 22544400421 is 12400444522.

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 4370664321 + 18173736100 = 66111^2 + 134810^2 .

It is a cyclic number.

It is not a de Polignac number, because 22544400421 - 2⁹ = 22544399909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22544400421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22544400427) 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, 31932226 + ... + 31932931.

It is an arithmetic number, because the mean of its divisors is an integer number (5652066483).

Almost surely, 2^22544400421 is an apocalyptic number.

It is an amenable number.

22544400421 is a deficient number, since it is larger than the sum of its proper divisors (63865511).

22544400421 is an equidigital number, since it uses as much as digits as its factorization.

22544400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63865510.

The product of its (nonzero) digits is 10240, while the sum is 28.

Adding to 22544400421 its reverse (12400444522), we get a palindrome (34944844943).

The spelling of 22544400421 in words is "twenty-two billion, five hundred forty-four million, four hundred thousand, four hundred twenty-one".