311131433421 has 64 divisors (see below), whose sum is σ = 491087923200. Its totient is φ = 194274001152.

The previous prime is 311131433413. The next prime is 311131433423. The reversal of 311131433421 is 124334131113.

311131433421 is a `hidden beast` number, since 3 + 1 + 1 + 1 + 314 + 3 + 342 + 1 = 666.

It is not a de Polignac number, because 311131433421 - 2³ = 311131433413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311131433423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5797650 + ... + 5851068.

It is an arithmetic number, because the mean of its divisors is an integer number (7673248800).

Almost surely, 2^311131433421 is an apocalyptic number.

It is an amenable number.

311131433421 is a deficient number, since it is larger than the sum of its proper divisors (179956489779).

311131433421 is a wasteful number, since it uses less digits than its factorization.

311131433421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53647 (or 53641 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 311131433421 its reverse (124334131113), we get a palindrome (435465564534).

The spelling of 311131433421 in words is "three hundred eleven billion, one hundred thirty-one million, four hundred thirty-three thousand, four hundred twenty-one".