21243314179 has 2 divisors, whose sum is σ = 21243314180. Its totient is φ = 21243314178.

The previous prime is 21243314177. The next prime is 21243314251. The reversal of 21243314179 is 97141334212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21243314179 - 2¹ = 21243314177 is a prime.

Together with 21243314177, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21243314177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621657089 + 10621657090.

It is an arithmetic number, because the mean of its divisors is an integer number (10621657090).

Almost surely, 2^21243314179 is an apocalyptic number.

21243314179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21243314179 is an equidigital number, since it uses as much as digits as its factorization.

21243314179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The spelling of 21243314179 in words is "twenty-one billion, two hundred forty-three million, three hundred fourteen thousand, one hundred seventy-nine".