21204113244 has 24 divisors (see below), whose sum is σ = 49512655248. Its totient is φ = 7062839040.

The previous prime is 21204113237. The next prime is 21204113261. The reversal of 21204113244 is 44231140212.

It is a super-2 number, since 2×21204113244² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632827 + ... + 665490.

It is an arithmetic number, because the mean of its divisors is an integer number (2063027302).

Almost surely, 2^21204113244 is an apocalyptic number.

It is an amenable number.

21204113244 is an abundant number, since it is smaller than the sum of its proper divisors (28308542004).

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

21204113244 is a wasteful number, since it uses less digits than its factorization.

21204113244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299685 (or 1299683 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21204113244 its reverse (44231140212), we get a palindrome (65435253456).

The spelling of 21204113244 in words is "twenty-one billion, two hundred four million, one hundred thirteen thousand, two hundred forty-four".