313331020221 has 12 divisors (see below), whose sum is σ = 419906298272. Its totient is φ = 207826927728.

The previous prime is 313331020217. The next prime is 313331020237. The reversal of 313331020221 is 122020133313.

It is not a de Polignac number, because 313331020221 - 2² = 313331020217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313331020201) 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, 1229185 + ... + 1462038.

Almost surely, 2^313331020221 is an apocalyptic number.

It is an amenable number.

313331020221 is a deficient number, since it is larger than the sum of its proper divisors (106575278051).

313331020221 is an equidigital number, since it uses as much as digits as its factorization.

313331020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691620 (or 2691423 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 313331020221 its reverse (122020133313), we get a palindrome (435351153534).

The spelling of 313331020221 in words is "three hundred thirteen billion, three hundred thirty-one million, twenty thousand, two hundred twenty-one".