21236000244 has 48 divisors (see below), whose sum is σ = 50055667200. Its totient is φ = 7006635616.

The previous prime is 21236000239. The next prime is 21236000251. The reversal of 21236000244 is 44200063212.

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 15 ways as a sum of consecutive naturals, for example, 1687327 + ... + 1699865.

It is an arithmetic number, because the mean of its divisors is an integer number (1042826400).

Almost surely, 2^21236000244 is an apocalyptic number.

It is an amenable number.

21236000244 is an abundant number, since it is smaller than the sum of its proper divisors (28819666956).

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

21236000244 is a wasteful number, since it uses less digits than its factorization.

21236000244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13972 (or 13970 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21236000244 its reverse (44200063212), we get a palindrome (65436063456).

The spelling of 21236000244 in words is "twenty-one billion, two hundred thirty-six million, two hundred forty-four", and thus it is an aban number.