21338522944 has 56 divisors (see below), whose sum is σ = 46380516840. Its totient is φ = 9695379456.

The previous prime is 21338522873. The next prime is 21338522957. The reversal of 21338522944 is 44922583312.

It can be written as a sum of positive squares in 4 ways, for example, as 570254400 + 20768268544 = 23880^2 + 144112^2 .

It is a super-2 number, since 2×21338522944² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21338522944.

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, 306597 + ... + 369700.

It is an arithmetic number, because the mean of its divisors is an integer number (828223515).

Almost surely, 2^21338522944 is an apocalyptic number.

It is an amenable number.

21338522944 is an abundant number, since it is smaller than the sum of its proper divisors (25041993896).

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

21338522944 is a wasteful number, since it uses less digits than its factorization.

21338522944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676355 (or 676345 counting only the distinct ones).

The product of its digits is 414720, while the sum is 43.

The spelling of 21338522944 in words is "twenty-one billion, three hundred thirty-eight million, five hundred twenty-two thousand, nine hundred forty-four".