22121444425 has 24 divisors (see below), whose sum is σ = 28255113432. Its totient is φ = 17169984000.

The previous prime is 22121444417. The next prime is 22121444437. The reversal of 22121444425 is 52444412122.

It can be written as a sum of positive squares in 12 ways, for example, as 21700825344 + 420619081 = 147312^2 + 20509^2 .

It is not a de Polignac number, because 22121444425 - 2³ = 22121444417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125907 + ... + 245143.

It is an arithmetic number, because the mean of its divisors is an integer number (1177296393).

Almost surely, 2^22121444425 is an apocalyptic number.

22121444425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22121444425 is a deficient number, since it is larger than the sum of its proper divisors (6133669007).

22121444425 is a wasteful number, since it uses less digits than its factorization.

22121444425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119469 (or 119464 counting only the distinct ones).

The product of its digits is 20480, while the sum is 31.

Adding to 22121444425 its reverse (52444412122), we get a palindrome (74565856547).

The spelling of 22121444425 in words is "twenty-two billion, one hundred twenty-one million, four hundred forty-four thousand, four hundred twenty-five".