21167994199 has 4 divisors (see below), whose sum is σ = 23092357320. Its totient is φ = 19243631080.

The previous prime is 21167994163. The next prime is 21167994233. The reversal of 21167994199 is 99149976112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21167994199 - 2⁹ = 21167993687 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 (21167994139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962181544 + ... + 962181565.

It is an arithmetic number, because the mean of its divisors is an integer number (5773089330).

Almost surely, 2^21167994199 is an apocalyptic number.

21167994199 is a deficient number, since it is larger than the sum of its proper divisors (1924363121).

21167994199 is a wasteful number, since it uses less digits than its factorization.

21167994199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924363120.

The product of its digits is 2204496, while the sum is 58.

The spelling of 21167994199 in words is "twenty-one billion, one hundred sixty-seven million, nine hundred ninety-four thousand, one hundred ninety-nine".