1321201313239 has 2 divisors, whose sum is σ = 1321201313240. Its totient is φ = 1321201313238.

The previous prime is 1321201313183. The next prime is 1321201313323. The reversal of 1321201313239 is 9323131021231.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9323131021231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321201313239 is a prime.

It is a super-2 number, since 2×1321201313239² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321201313239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321201313339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660600656619 + 660600656620.

It is an arithmetic number, because the mean of its divisors is an integer number (660600656620).

Almost surely, 2^{1321201313239} is an apocalyptic number.

1321201313239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321201313239 is an equidigital number, since it uses as much as digits as its factorization.

1321201313239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The spelling of 1321201313239 in words is "one trillion, three hundred twenty-one billion, two hundred one million, three hundred thirteen thousand, two hundred thirty-nine".