21099804472 has 16 divisors (see below), whose sum is σ = 39620928240. Its totient is φ = 10534223616.

The previous prime is 21099804391. The next prime is 21099804487. The reversal of 21099804472 is 27440899012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1954108 + ... + 1964875.

It is an arithmetic number, because the mean of its divisors is an integer number (2476308015).

Almost surely, 2^21099804472 is an apocalyptic number.

It is an amenable number.

21099804472 is a deficient number, since it is larger than the sum of its proper divisors (18521123768).

21099804472 is a wasteful number, since it uses less digits than its factorization.

21099804472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919662 (or 3919658 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 21099804472 in words is "twenty-one billion, ninety-nine million, eight hundred four thousand, four hundred seventy-two".