21013312339 has 2 divisors, whose sum is σ = 21013312340. Its totient is φ = 21013312338.

The previous prime is 21013312303. The next prime is 21013312367. The reversal of 21013312339 is 93321331012.

It is an a-pointer prime, because the next prime (21013312367) can be obtained adding 21013312339 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21013312339 is a prime.

It is not a weakly prime, because it can be changed into another prime (21013312399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506656169 + 10506656170.

It is an arithmetic number, because the mean of its divisors is an integer number (10506656170).

Almost surely, 2^21013312339 is an apocalyptic number.

21013312339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013312339 is an equidigital number, since it uses as much as digits as its factorization.

21013312339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 21013312339 in words is "twenty-one billion, thirteen million, three hundred twelve thousand, three hundred thirty-nine".