313021213221 has 16 divisors (see below), whose sum is σ = 430985576448. Its totient is φ = 201873850800.

The previous prime is 313021213189. The next prime is 313021213259. The reversal of 313021213221 is 122312120313.

It is not a de Polignac number, because 313021213221 - 2⁵ = 313021213189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313021213291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376425 + ... + 876206.

It is an arithmetic number, because the mean of its divisors is an integer number (26936598528).

Almost surely, 2^313021213221 is an apocalyptic number.

313021213221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

313021213221 is a deficient number, since it is larger than the sum of its proper divisors (117964363227).

313021213221 is a wasteful number, since it uses less digits than its factorization.

313021213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255352.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 313021213221 its reverse (122312120313), we get a palindrome (435333333534).

The spelling of 313021213221 in words is "three hundred thirteen billion, twenty-one million, two hundred thirteen thousand, two hundred twenty-one".