21244444325 has 12 divisors (see below), whose sum is σ = 28369504548. Its totient is φ = 15688204800.

The previous prime is 21244444307. The next prime is 21244444337. The reversal of 21244444325 is 52344444212.

It can be written as a sum of positive squares in 6 ways, for example, as 1496606596 + 19747837729 = 38686^2 + 140527^2 .

It is not a de Polignac number, because 21244444325 - 2¹² = 21244440229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32683436 + ... + 32684085.

It is an arithmetic number, because the mean of its divisors is an integer number (2364125379).

Almost surely, 2^21244444325 is an apocalyptic number.

21244444325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21244444325 is a deficient number, since it is larger than the sum of its proper divisors (7125060223).

21244444325 is a wasteful number, since it uses less digits than its factorization.

21244444325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65367544 (or 65367539 counting only the distinct ones).

The product of its digits is 122880, while the sum is 35.

Adding to 21244444325 its reverse (52344444212), we get a palindrome (73588888537).

The spelling of 21244444325 in words is "twenty-one billion, two hundred forty-four million, four hundred forty-four thousand, three hundred twenty-five".