3131213421 has 16 divisors (see below), whose sum is σ = 4772155904. Its totient is φ = 1788971184.

The previous prime is 3131213411. The next prime is 3131213453. The reversal of 3131213421 is 1243121313.

3131213421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3131213421 - 2¹³ = 3131205229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131213411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234306 + ... + 247308.

It is an arithmetic number, because the mean of its divisors is an integer number (298259744).

Almost surely, 2^3131213421 is an apocalyptic number.

It is an amenable number.

3131213421 is a deficient number, since it is larger than the sum of its proper divisors (1640942483).

3131213421 is a wasteful number, since it uses less digits than its factorization.

3131213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24480.

The product of its digits is 432, while the sum is 21.

The square root of 3131213421 is about 55957.2463672043. The cubic root of 3131213421 is about 1462.9771957885.

Adding to 3131213421 its reverse (1243121313), we get a palindrome (4374334734).

The spelling of 3131213421 in words is "three billion, one hundred thirty-one million, two hundred thirteen thousand, four hundred twenty-one".