21232400244 has 24 divisors (see below), whose sum is σ = 54046110048. Its totient is φ = 6434060640.

The previous prime is 21232400239. The next prime is 21232400263. The reversal of 21232400244 is 44200423212.

It is a super-2 number, since 2×21232400244² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80425627 + ... + 80425890.

It is an arithmetic number, because the mean of its divisors is an integer number (2251921252).

Almost surely, 2^21232400244 is an apocalyptic number.

It is an amenable number.

21232400244 is an abundant number, since it is smaller than the sum of its proper divisors (32813709804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232400244 is a wasteful number, since it uses less digits than its factorization.

21232400244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160851535 (or 160851533 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21232400244 its reverse (44200423212), we get a palindrome (65432823456).

The spelling of 21232400244 in words is "twenty-one billion, two hundred thirty-two million, four hundred thousand, two hundred forty-four".