1321216631313 has 4 divisors (see below), whose sum is σ = 1761622175088. Its totient is φ = 880811087540.

The previous prime is 1321216631291. The next prime is 1321216631327. The reversal of 1321216631313 is 3131366121231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321216631313 - 2⁸ = 1321216631057 is a prime.

It is a super-2 number, since 2×1321216631313² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321216631513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220202771883 + ... + 220202771888.

It is an arithmetic number, because the mean of its divisors is an integer number (440405543772).

Almost surely, 2^{1321216631313} is an apocalyptic number.

It is an amenable number.

1321216631313 is a deficient number, since it is larger than the sum of its proper divisors (440405543775).

1321216631313 is an equidigital number, since it uses as much as digits as its factorization.

1321216631313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440405543774.

The product of its digits is 11664, while the sum is 33.

The spelling of 1321216631313 in words is "one trillion, three hundred twenty-one billion, two hundred sixteen million, six hundred thirty-one thousand, three hundred thirteen".