121331321 has 4 divisors (see below), whose sum is σ = 127717200. Its totient is φ = 114945444.

The previous prime is 121331269. The next prime is 121331333. The reversal of 121331321 is 123133121.

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 a cyclic number.

It is not a de Polignac number, because 121331321 - 2¹⁴ = 121314937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121331321.

It is not an unprimeable number, because it can be changed into a prime (121331381) 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, 3192911 + ... + 3192948.

It is an arithmetic number, because the mean of its divisors is an integer number (31929300).

Almost surely, 2^121331321 is an apocalyptic number.

It is an amenable number.

121331321 is a deficient number, since it is larger than the sum of its proper divisors (6385879).

121331321 is an equidigital number, since it uses as much as digits as its factorization.

121331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6385878.

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

The square root of 121331321 is about 11015.0497502281. The cubic root of 121331321 is about 495.0597771566.

Adding to 121331321 its reverse (123133121), we get a palindrome (244464442).

The spelling of 121331321 in words is "one hundred twenty-one million, three hundred thirty-one thousand, three hundred twenty-one".