321121213 has 4 divisors (see below), whose sum is σ = 366995680. Its totient is φ = 275246748.

The previous prime is 321121189. The next prime is 321121259. The reversal of 321121213 is 312121123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 321121213 - 2¹³ = 321113021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321124213) 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, 22937223 + ... + 22937236.

It is an arithmetic number, because the mean of its divisors is an integer number (91748920).

Almost surely, 2^321121213 is an apocalyptic number.

It is an amenable number.

321121213 is a deficient number, since it is larger than the sum of its proper divisors (45874467).

321121213 is an equidigital number, since it uses as much as digits as its factorization.

321121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45874466.

The product of its digits is 72, while the sum is 16.

The square root of 321121213 is about 17919.8552728531. The cubic root of 321121213 is about 684.7883005035.

Adding to 321121213 its reverse (312121123), we get a palindrome (633242336).

The spelling of 321121213 in words is "three hundred twenty-one million, one hundred twenty-one thousand, two hundred thirteen".