21004400199 has 16 divisors (see below), whose sum is σ = 28132488320. Its totient is φ = 13939763040.

The previous prime is 21004400141. The next prime is 21004400203. The reversal of 21004400199 is 99100440012.

It is not a de Polignac number, because 21004400199 - 2⁸ = 21004399943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004400999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598044 + ... + 632190.

It is an arithmetic number, because the mean of its divisors is an integer number (1758280520).

Almost surely, 2^21004400199 is an apocalyptic number.

21004400199 is a deficient number, since it is larger than the sum of its proper divisors (7128088121).

21004400199 is a wasteful number, since it uses less digits than its factorization.

21004400199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35070.

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 21004400199 in words is "twenty-one billion, four million, four hundred thousand, one hundred ninety-nine".