313021121 has 4 divisors (see below), whose sum is σ = 357738432. Its totient is φ = 268303812.

The previous prime is 313021097. The next prime is 313021129. The reversal of 313021121 is 121120313.

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: 121120313 = 181 ⋅669173.

It is not a de Polignac number, because 313021121 - 2⁶ = 313021057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313021096 and 313021105.

It is not an unprimeable number, because it can be changed into a prime (313021129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22358645 + ... + 22358658.

It is an arithmetic number, because the mean of its divisors is an integer number (89434608).

Almost surely, 2^313021121 is an apocalyptic number.

It is an amenable number.

313021121 is a deficient number, since it is larger than the sum of its proper divisors (44717311).

313021121 is an equidigital number, since it uses as much as digits as its factorization.

313021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44717310.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 313021121 is about 17692.4029176367. The cubic root of 313021121 is about 678.9814053383.

Adding to 313021121 its reverse (121120313), we get a palindrome (434141434).

It can be divided in two parts, 31302 and 1121, that added together give a palindrome (32423).

The spelling of 313021121 in words is "three hundred thirteen million, twenty-one thousand, one hundred twenty-one".