21832506640 has 60 divisors (see below), whose sum is σ = 59048029836. Its totient is φ = 7485429504.

The previous prime is 21832506613. The next prime is 21832506677. The reversal of 21832506640 is 4660523812.

It can be written as a sum of positive squares in 2 ways, for example, as 14930884864 + 6901621776 = 122192^2 + 83076^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21832506640.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2780839 + ... + 2788678.

Almost surely, 2^21832506640 is an apocalyptic number.

21832506640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21832506640 is an abundant number, since it is smaller than the sum of its proper divisors (37215523196).

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

21832506640 is a wasteful number, since it uses less digits than its factorization.

21832506640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5569544 (or 5569531 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 21832506640 in words is "twenty-one billion, eight hundred thirty-two million, five hundred six thousand, six hundred forty".