21889523864 has 32 divisors (see below), whose sum is σ = 44214870000. Its totient is φ = 10099458432.

The previous prime is 21889523839. The next prime is 21889523893. The reversal of 21889523864 is 46832598812.

It is a happy number.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

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, 289487 + ... + 357185.

Almost surely, 2^21889523864 is an apocalyptic number.

It is an amenable number.

21889523864 is an abundant number, since it is smaller than the sum of its proper divisors (22325346136).

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

21889523864 is a wasteful number, since it uses less digits than its factorization.

21889523864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70827 (or 70823 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 56.

The spelling of 21889523864 in words is "twenty-one billion, eight hundred eighty-nine million, five hundred twenty-three thousand, eight hundred sixty-four".