311312421 has 24 divisors (see below), whose sum is σ = 515274240. Its totient is φ = 177421536.

The previous prime is 311312399. The next prime is 311312423. The reversal of 311312421 is 124213113.

311312421 is a `hidden beast` number, since 311 + 312 + 42 + 1 = 666.

It is not a de Polignac number, because 311312421 - 2⁷ = 311312293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311312394 and 311312403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311312423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18156 + ... + 30858.

It is an arithmetic number, because the mean of its divisors is an integer number (21469760).

Almost surely, 2^311312421 is an apocalyptic number.

It is an amenable number.

311312421 is a deficient number, since it is larger than the sum of its proper divisors (203961819).

311312421 is a wasteful number, since it uses less digits than its factorization.

311312421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13105 (or 13102 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 311312421 is about 17644.0477498787. The cubic root of 311312421 is about 677.7436901536.

Adding to 311312421 its reverse (124213113), we get a palindrome (435525534).

The spelling of 311312421 in words is "three hundred eleven million, three hundred twelve thousand, four hundred twenty-one".