3121311221313 has 4 divisors (see below), whose sum is σ = 4161748295088. Its totient is φ = 2080874147540.

The previous prime is 3121311221227. The next prime is 3121311221323. The reversal of 3121311221313 is 3131221131213.

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 3121311221313 - 2¹⁶ = 3121311155777 is a prime.

It is a super-3 number, since 3×3121311221313³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (3121311221323) 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, 520218536883 + ... + 520218536888.

It is an arithmetic number, because the mean of its divisors is an integer number (1040437073772).

Almost surely, 2^{3121311221313} is an apocalyptic number.

It is an amenable number.

3121311221313 is a deficient number, since it is larger than the sum of its proper divisors (1040437073775).

3121311221313 is a wasteful number, since it uses less digits than its factorization.

3121311221313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040437073774.

The product of its digits is 648, while the sum is 24.

Adding to 3121311221313 its reverse (3131221131213), we get a palindrome (6252532352526).

The spelling of 3121311221313 in words is "three trillion, one hundred twenty-one billion, three hundred eleven million, two hundred twenty-one thousand, three hundred thirteen".