313113111221 has 4 divisors (see below), whose sum is σ = 314923013772. Its totient is φ = 311303208672.

The previous prime is 313113111193. The next prime is 313113111299. The reversal of 313113111221 is 122111311313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122111311313 = 13799 ⋅8849287.

It can be written as a sum of positive squares in 2 ways, for example, as 137351772100 + 175761339121 = 370610^2 + 419239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313113111221 is a prime.

It is a super-2 number, since 2×313113111221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313113111193 and 313113111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313113141221) 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, 904951016 + ... + 904951361.

It is an arithmetic number, because the mean of its divisors is an integer number (78730753443).

Almost surely, 2^313113111221 is an apocalyptic number.

It is an amenable number.

313113111221 is a deficient number, since it is larger than the sum of its proper divisors (1809902551).

313113111221 is a wasteful number, since it uses less digits than its factorization.

313113111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809902550.

The product of its digits is 108, while the sum is 20.

Adding to 313113111221 its reverse (122111311313), we get a palindrome (435224422534).

The spelling of 313113111221 in words is "three hundred thirteen billion, one hundred thirteen million, one hundred eleven thousand, two hundred twenty-one".