321232213121 has 4 divisors (see below), whose sum is σ = 321272110932. Its totient is φ = 321192315312.

The previous prime is 321232213111. The next prime is 321232213147. The reversal of 321232213121 is 121312232123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 141405329521 + 179826883600 = 376039^2 + 424060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321232213121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321232213111) 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, 19936826 + ... + 19952931.

It is an arithmetic number, because the mean of its divisors is an integer number (80318027733).

Almost surely, 2^321232213121 is an apocalyptic number.

It is an amenable number.

321232213121 is a deficient number, since it is larger than the sum of its proper divisors (39897811).

321232213121 is an equidigital number, since it uses as much as digits as its factorization.

321232213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39897810.

The product of its digits is 864, while the sum is 23.

Adding to 321232213121 its reverse (121312232123), we get a palindrome (442544445244).

The spelling of 321232213121 in words is "three hundred twenty-one billion, two hundred thirty-two million, two hundred thirteen thousand, one hundred twenty-one".