21191919183 has 12 divisors (see below), whose sum is σ = 30693962208. Its totient is φ = 14089448160.

The previous prime is 21191919181. The next prime is 21191919187. The reversal of 21191919183 is 38191919112.

It is not a de Polignac number, because 21191919183 - 2¹ = 21191919181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21191919181) 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, 3204678 + ... + 3211283.

It is an arithmetic number, because the mean of its divisors is an integer number (2557830184).

Almost surely, 2^21191919183 is an apocalyptic number.

21191919183 is a deficient number, since it is larger than the sum of its proper divisors (9502043025).

21191919183 is a wasteful number, since it uses less digits than its factorization.

21191919183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6416334 (or 6416331 counting only the distinct ones).

The product of its digits is 34992, while the sum is 45.

The spelling of 21191919183 in words is "twenty-one billion, one hundred ninety-one million, nine hundred nineteen thousand, one hundred eighty-three".