21912799185 has 80 divisors (see below), whose sum is σ = 40819204800. Its totient is φ = 11232756864.

The previous prime is 21912799171. The next prime is 21912799189. The reversal of 21912799185 is 58199721912.

It is a happy number.

21912799185 is a `hidden beast` number, since 2 + 191 + 279 + 9 + 185 = 666.

It is not a de Polignac number, because 21912799185 - 2⁶ = 21912799121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21912799189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2662006 + ... + 2670224.

It is an arithmetic number, because the mean of its divisors is an integer number (510240060).

Almost surely, 2^21912799185 is an apocalyptic number.

It is an amenable number.

21912799185 is a deficient number, since it is larger than the sum of its proper divisors (18906405615).

21912799185 is a wasteful number, since it uses less digits than its factorization.

21912799185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492 (or 8483 counting only the distinct ones).

The product of its digits is 816480, while the sum is 54.

The spelling of 21912799185 in words is "twenty-one billion, nine hundred twelve million, seven hundred ninety-nine thousand, one hundred eighty-five".