21313115839 has 2 divisors, whose sum is σ = 21313115840. Its totient is φ = 21313115838.

The previous prime is 21313115777. The next prime is 21313115861. The reversal of 21313115839 is 93851131312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21313115839 - 2²³ = 21304727231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21313115798 and 21313115807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313115039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656557919 + 10656557920.

It is an arithmetic number, because the mean of its divisors is an integer number (10656557920).

Almost surely, 2^21313115839 is an apocalyptic number.

21313115839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313115839 is an equidigital number, since it uses as much as digits as its factorization.

21313115839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The spelling of 21313115839 in words is "twenty-one billion, three hundred thirteen million, one hundred fifteen thousand, eight hundred thirty-nine".