21183994801 has 16 divisors (see below), whose sum is σ = 22091908608. Its totient is φ = 20291184000.

The previous prime is 21183994787. The next prime is 21183994847. The reversal of 21183994801 is 10849938112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21183994801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21183994891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1208701 + ... + 1226101.

It is an arithmetic number, because the mean of its divisors is an integer number (1380744288).

Almost surely, 2^21183994801 is an apocalyptic number.

It is an amenable number.

21183994801 is a deficient number, since it is larger than the sum of its proper divisors (907913807).

21183994801 is a wasteful number, since it uses less digits than its factorization.

21183994801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17832.

The product of its (nonzero) digits is 124416, while the sum is 46.

The spelling of 21183994801 in words is "twenty-one billion, one hundred eighty-three million, nine hundred ninety-four thousand, eight hundred one".