21000023309179 has 2 divisors, whose sum is σ = 21000023309180. Its totient is φ = 21000023309178.

The previous prime is 21000023309159. The next prime is 21000023309191. The reversal of 21000023309179 is 97190332000012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000023309179 - 2²³ = 21000014920571 is a prime.

It is a super-2 number, since 2×21000023309179² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21000023309149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500011654589 + 10500011654590.

It is an arithmetic number, because the mean of its divisors is an integer number (10500011654590).

Almost surely, 2^{21000023309179} is an apocalyptic number.

21000023309179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000023309179 is an equidigital number, since it uses as much as digits as its factorization.

21000023309179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 37.

The spelling of 21000023309179 in words is "twenty-one trillion, twenty-three million, three hundred nine thousand, one hundred seventy-nine".