21963818179 has 2 divisors, whose sum is σ = 21963818180. Its totient is φ = 21963818178.

The previous prime is 21963818161. The next prime is 21963818243. The reversal of 21963818179 is 97181836912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21963818179 - 2¹⁵ = 21963785411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21963810179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10981909089 + 10981909090.

It is an arithmetic number, because the mean of its divisors is an integer number (10981909090).

Almost surely, 2^21963818179 is an apocalyptic number.

21963818179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21963818179 is an equidigital number, since it uses as much as digits as its factorization.

21963818179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 55.

The spelling of 21963818179 in words is "twenty-one billion, nine hundred sixty-three million, eight hundred eighteen thousand, one hundred seventy-nine".