21986091624 has 64 divisors (see below), whose sum is σ = 62829728640. Its totient is φ = 6280508160.

The previous prime is 21986091599. The next prime is 21986091629. The reversal of 21986091624 is 42619068912.

It is not an unprimeable number, because it can be changed into a prime (21986091629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1168854 + ... + 1187514.

It is an arithmetic number, because the mean of its divisors is an integer number (981714510).

Almost surely, 2^21986091624 is an apocalyptic number.

21986091624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21986091624 is an abundant number, since it is smaller than the sum of its proper divisors (40843637016).

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

21986091624 is a wasteful number, since it uses less digits than its factorization.

21986091624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25690 (or 25686 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 21986091624 in words is "twenty-one billion, nine hundred eighty-six million, ninety-one thousand, six hundred twenty-four".