313021221121 has 4 divisors (see below), whose sum is σ = 357738538432. Its totient is φ = 268303903812.

The previous prime is 313021221067. The next prime is 313021221167. The reversal of 313021221121 is 121122120313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121122120313 = 176777 ⋅685169.

It is not a de Polignac number, because 313021221121 - 2¹¹ = 313021219073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (313021227121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22358658645 + ... + 22358658658.

It is an arithmetic number, because the mean of its divisors is an integer number (89434634608).

Almost surely, 2^313021221121 is an apocalyptic number.

It is an amenable number.

313021221121 is a deficient number, since it is larger than the sum of its proper divisors (44717317311).

313021221121 is an equidigital number, since it uses as much as digits as its factorization.

313021221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44717317310.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 313021221121 its reverse (121122120313), we get a palindrome (434143341434).

The spelling of 313021221121 in words is "three hundred thirteen billion, twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".