121312013239 has 2 divisors, whose sum is σ = 121312013240. Its totient is φ = 121312013238.

The previous prime is 121312013197. The next prime is 121312013299. The reversal of 121312013239 is 932310213121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121312013239 is a prime.

It is a super-2 number, since 2×121312013239² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121312013299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656006619 + 60656006620.

It is an arithmetic number, because the mean of its divisors is an integer number (60656006620).

Almost surely, 2^121312013239 is an apocalyptic number.

121312013239 is a deficient number, since it is larger than the sum of its proper divisors (1).

121312013239 is an equidigital number, since it uses as much as digits as its factorization.

121312013239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 121312013239 in words is "one hundred twenty-one billion, three hundred twelve million, thirteen thousand, two hundred thirty-nine".