321213131 has 4 divisors (see below), whose sum is σ = 325279200. Its totient is φ = 317147064.

The previous prime is 321213127. The next prime is 321213149. The reversal of 321213131 is 131312123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131312123 = 197 ⋅666559.

It is a cyclic number.

It is not a de Polignac number, because 321213131 - 2² = 321213127 is a prime.

It is a super-2 number, since 2×321213131² = 206355751053646322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321213121) 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, 2032916 + ... + 2033073.

It is an arithmetic number, because the mean of its divisors is an integer number (81319800).

Almost surely, 2^321213131 is an apocalyptic number.

321213131 is a deficient number, since it is larger than the sum of its proper divisors (4066069).

321213131 is an equidigital number, since it uses as much as digits as its factorization.

321213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066068.

The product of its digits is 108, while the sum is 17.

The square root of 321213131 is about 17922.4197864016. The cubic root of 321213131 is about 684.8536323923.

Adding to 321213131 its reverse (131312123), we get a palindrome (452525254).

The spelling of 321213131 in words is "three hundred twenty-one million, two hundred thirteen thousand, one hundred thirty-one".