21924108640 has 48 divisors (see below), whose sum is σ = 59195096352. Its totient is φ = 7516836864.

The previous prime is 21924108593. The next prime is 21924108697. The reversal of 21924108640 is 4680142912.

It is a self number, because there is not a number n which added to its sum of digits gives 21924108640.

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, 9786429 + ... + 9788668.

It is an arithmetic number, because the mean of its divisors is an integer number (1233231174).

Almost surely, 2^21924108640 is an apocalyptic number.

21924108640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21924108640 is an abundant number, since it is smaller than the sum of its proper divisors (37270987712).

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

21924108640 is a wasteful number, since it uses less digits than its factorization.

21924108640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19575119 (or 19575111 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 21924108640 in words is "twenty-one billion, nine hundred twenty-four million, one hundred eight thousand, six hundred forty".