21109337199 has 12 divisors (see below), whose sum is σ = 31315353576. Its totient is φ = 13692542832.

The previous prime is 21109337177. The next prime is 21109337209. The reversal of 21109337199 is 99173390112.

21109337199 is a `hidden beast` number, since 21 + 109 + 337 + 199 = 666.

It is not a de Polignac number, because 21109337199 - 2⁹ = 21109336687 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21109337399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31695369 + ... + 31696034.

It is an arithmetic number, because the mean of its divisors is an integer number (2609612798).

Almost surely, 2^21109337199 is an apocalyptic number.

21109337199 is a deficient number, since it is larger than the sum of its proper divisors (10206016377).

21109337199 is a wasteful number, since it uses less digits than its factorization.

21109337199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63391446 (or 63391443 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 45.

The spelling of 21109337199 in words is "twenty-one billion, one hundred nine million, three hundred thirty-seven thousand, one hundred ninety-nine".