3131212321 has 8 divisors (see below), whose sum is σ = 3179030400. Its totient is φ = 3083598960.

The previous prime is 3131212291. The next prime is 3131212361. The reversal of 3131212321 is 1232121313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3131212321 - 2⁷ = 3131212193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3131212361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20215 + ... + 81676.

It is an arithmetic number, because the mean of its divisors is an integer number (397378800).

Almost surely, 2^3131212321 is an apocalyptic number.

It is an amenable number.

3131212321 is a deficient number, since it is larger than the sum of its proper divisors (47818079).

3131212321 is a wasteful number, since it uses less digits than its factorization.

3131212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102359.

The product of its digits is 216, while the sum is 19.

The square root of 3131212321 is about 55957.2365382709. The cubic root of 3131212321 is about 1462.9770244731.

Adding to 3131212321 its reverse (1232121313), we get a palindrome (4363333634).

The spelling of 3131212321 in words is "three billion, one hundred thirty-one million, two hundred twelve thousand, three hundred twenty-one".