21200531244 has 24 divisors (see below), whose sum is σ = 51618685440. Its totient is φ = 6759589584.

The previous prime is 21200531237. The next prime is 21200531249. The reversal of 21200531244 is 44213500212.

It is not an unprimeable number, because it can be changed into a prime (21200531249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38406484 + ... + 38407035.

It is an arithmetic number, because the mean of its divisors is an integer number (2150778560).

Almost surely, 2^21200531244 is an apocalyptic number.

It is an amenable number.

21200531244 is an abundant number, since it is smaller than the sum of its proper divisors (30418154196).

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

21200531244 is a wasteful number, since it uses less digits than its factorization.

21200531244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76813549 (or 76813547 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The spelling of 21200531244 in words is "twenty-one billion, two hundred million, five hundred thirty-one thousand, two hundred forty-four".