311421121 has 4 divisors (see below), whose sum is σ = 339732144. Its totient is φ = 283110100.

The previous prime is 311421109. The next prime is 311421137. The reversal of 311421121 is 121124113.

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: 121124113 = 11 ⋅11011283.

It is a cyclic number.

It is not a de Polignac number, because 311421121 - 2⁹ = 311420609 is a prime.

It is a super-2 number, since 2×311421121² = 193966229209793282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311421095 and 311421104.

It is not an unprimeable number, because it can be changed into a prime (311421101) 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, 14155495 + ... + 14155516.

It is an arithmetic number, because the mean of its divisors is an integer number (84933036).

Almost surely, 2^311421121 is an apocalyptic number.

It is an amenable number.

311421121 is a deficient number, since it is larger than the sum of its proper divisors (28311023).

311421121 is a wasteful number, since it uses less digits than its factorization.

311421121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28311022.

The product of its digits is 48, while the sum is 16.

The square root of 311421121 is about 17647.1278399631. The cubic root of 311421121 is about 677.8225628673.

Adding to 311421121 its reverse (121124113), we get a palindrome (432545234).

The spelling of 311421121 in words is "three hundred eleven million, four hundred twenty-one thousand, one hundred twenty-one".