21183994799 has 8 divisors (see below), whose sum is σ = 23388244992. Its totient is φ = 19026150040.

The previous prime is 21183994787. The next prime is 21183994847. The reversal of 21183994799 is 99749938112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21183994799 - 2²⁰ = 21182946223 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 (21183994709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11600399 + ... + 11602224.

It is an arithmetic number, because the mean of its divisors is an integer number (2923530624).

Almost surely, 2^21183994799 is an apocalyptic number.

21183994799 is a deficient number, since it is larger than the sum of its proper divisors (2204250193).

21183994799 is a wasteful number, since it uses less digits than its factorization.

21183994799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23202717.

The product of its digits is 8817984, while the sum is 62.

The spelling of 21183994799 in words is "twenty-one billion, one hundred eighty-three million, nine hundred ninety-four thousand, seven hundred ninety-nine".