21099599584 has 24 divisors (see below), whose sum is σ = 47474099568. Its totient is φ = 9042685440.

The previous prime is 21099599531. The next prime is 21099599593. The reversal of 21099599584 is 48599599012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47097097 + ... + 47097544.

It is an arithmetic number, because the mean of its divisors is an integer number (1978087482).

Almost surely, 2^21099599584 is an apocalyptic number.

It is an amenable number.

21099599584 is an abundant number, since it is smaller than the sum of its proper divisors (26374499984).

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

21099599584 is an equidigital number, since it uses as much as digits as its factorization.

21099599584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94194658 (or 94194650 counting only the distinct ones).

The product of its (nonzero) digits is 10497600, while the sum is 61.

The spelling of 21099599584 in words is "twenty-one billion, ninety-nine million, five hundred ninety-nine thousand, five hundred eighty-four".