21126889944 has 96 divisors (see below), whose sum is σ = 63773190000. Its totient is φ = 6279192576.

The previous prime is 21126889937. The next prime is 21126889951. The reversal of 21126889944 is 44998862112.

It is a happy number.

21126889944 is a `hidden beast` number, since 211 + 268 + 89 + 94 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21126889937) and next prime (21126889951).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 430969 + ... + 477480.

Almost surely, 2^21126889944 is an apocalyptic number.

21126889944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21126889944 is an abundant number, since it is smaller than the sum of its proper divisors (42646300056).

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

21126889944 is a wasteful number, since it uses less digits than its factorization.

21126889944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908497 (or 908490 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The spelling of 21126889944 in words is "twenty-one billion, one hundred twenty-six million, eight hundred eighty-nine thousand, nine hundred forty-four".