313201332221 has 4 divisors (see below), whose sum is σ = 326818781472. Its totient is φ = 299583882972.

The previous prime is 313201332187. The next prime is 313201332233. The reversal of 313201332221 is 122233102313.

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 a de Polignac number, because none of the positive numbers 2^k-313201332221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 13617449227 = 313201332221 / (3 + 1 + 3 + 2 + 0 + 1 + 3 + 3 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313201392221) 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, 6808724591 + ... + 6808724636.

It is an arithmetic number, because the mean of its divisors is an integer number (81704695368).

Almost surely, 2^313201332221 is an apocalyptic number.

It is an amenable number.

313201332221 is a deficient number, since it is larger than the sum of its proper divisors (13617449251).

313201332221 is a wasteful number, since it uses less digits than its factorization.

313201332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13617449250.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 313201332221 its reverse (122233102313), we get a palindrome (435434434534).

The spelling of 313201332221 in words is "three hundred thirteen billion, two hundred one million, three hundred thirty-two thousand, two hundred twenty-one".