121331 has 4 divisors (see below), whose sum is σ = 138672. Its totient is φ = 103992.

The previous prime is 121327. The next prime is 121333. The reversal of 121331 is 133121.

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

It is not a de Polignac number, because 121331 - 2² = 121327 is a prime.

It is a super-2 number, since 2×121331² = 29442423122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121333) 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, 8660 + ... + 8673.

It is an arithmetic number, because the mean of its divisors is an integer number (34668).

2¹²¹³³¹ is an apocalyptic number.

121331 is a deficient number, since it is larger than the sum of its proper divisors (17341).

121331 is an equidigital number, since it uses as much as digits as its factorization.

121331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17340.

The product of its digits is 18, while the sum is 11.

The square root of 121331 is about 348.3259967329. The cubic root of 121331 is about 49.5059340572.

Adding to 121331 its reverse (133121), we get a palindrome (254452).

The spelling of 121331 in words is "one hundred twenty-one thousand, three hundred thirty-one".