321213 has 4 divisors (see below), whose sum is σ = 428288. Its totient is φ = 214140.

The previous prime is 321203. The next prime is 321221. The reversal of 321213 is 312123.

It is a happy number.

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 321213 - 2¹⁸ = 59069 is a prime.

It is a D-number.

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 (321203) 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, 53533 + ... + 53538.

It is an arithmetic number, because the mean of its divisors is an integer number (107072).

2³²¹²¹³ is an apocalyptic number.

It is an amenable number.

321213 is a deficient number, since it is larger than the sum of its proper divisors (107075).

321213 is a wasteful number, since it uses less digits than its factorization.

321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107074.

The product of its digits is 36, while the sum is 12.

The square root of 321213 is about 566.7565614971. The cubic root of 321213 is about 68.4853539291.

Subtracting from 321213 its sum of digits (12), we obtain a triangular number (321201 = T₈₀₁).

Adding to 321213 its reverse (312123), we get a palindrome (633336).

The spelling of 321213 in words is "three hundred twenty-one thousand, two hundred thirteen".