21098183904 has 72 divisors (see below), whose sum is σ = 68569104240. Its totient is φ = 6028051968.

The previous prime is 21098183881. The next prime is 21098183917. The reversal of 21098183904 is 40938189012.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 21098183904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5230669 + ... + 5234700.

It is an arithmetic number, because the mean of its divisors is an integer number (952348670).

Almost surely, 2^21098183904 is an apocalyptic number.

21098183904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21098183904 is an abundant number, since it is smaller than the sum of its proper divisors (47470920336).

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

21098183904 is a wasteful number, since it uses less digits than its factorization.

21098183904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10465392 (or 10465381 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 21098183904 in words is "twenty-one billion, ninety-eight million, one hundred eighty-three thousand, nine hundred four".