313021311221 has 4 divisors (see below), whose sum is σ = 326630933472. Its totient is φ = 299411688972.

The previous prime is 313021311209. The next prime is 313021311299. The reversal of 313021311221 is 122113120313.

It is a happy number.

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 not a de Polignac number, because 313021311221 - 2⁶ = 313021311157 is a prime.

It is a super-6 number, since 6×313021311221⁶ (a number of 70 digits) contains 666666 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313021311193 and 313021311202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313021311121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6804811091 + ... + 6804811136.

It is an arithmetic number, because the mean of its divisors is an integer number (81657733368).

Almost surely, 2^313021311221 is an apocalyptic number.

It is an amenable number.

313021311221 is a deficient number, since it is larger than the sum of its proper divisors (13609622251).

313021311221 is a wasteful number, since it uses less digits than its factorization.

313021311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13609622250.

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

Adding to 313021311221 its reverse (122113120313), we get a palindrome (435134431534).

The spelling of 313021311221 in words is "three hundred thirteen billion, twenty-one million, three hundred eleven thousand, two hundred twenty-one".