313101213221 has 12 divisors (see below), whose sum is σ = 327333660108. Its totient is φ = 299462976384.

The previous prime is 313101213203. The next prime is 313101213239. The reversal of 313101213221 is 122312101313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (313101213203) and next prime (313101213239).

It can be written as a sum of positive squares in 2 ways, for example, as 133652392225 + 179448820996 = 365585^2 + 423614^2 .

It is a de Polignac number, because none of the positive numbers 2^k-313101213221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313101213193 and 313101213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313101213281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10466141 + ... + 10496013.

It is an arithmetic number, because the mean of its divisors is an integer number (27277805009).

Almost surely, 2^313101213221 is an apocalyptic number.

It is an amenable number.

313101213221 is a deficient number, since it is larger than the sum of its proper divisors (14232446887).

313101213221 is a wasteful number, since it uses less digits than its factorization.

313101213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49732 (or 49709 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 313101213221 its reverse (122312101313), we get a palindrome (435413314534).

The spelling of 313101213221 in words is "three hundred thirteen billion, one hundred one million, two hundred thirteen thousand, two hundred twenty-one".