121331213 has 2 divisors, whose sum is σ = 121331214. Its totient is φ = 121331212.

The previous prime is 121331191. The next prime is 121331239. The reversal of 121331213 is 312133121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109893289 + 11437924 = 10483^2 + 3382^2 .

It is a cyclic number.

It is not a de Polignac number, because 121331213 - 2²⁴ = 104553997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121331191 and 121331200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121331113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60665606 + 60665607.

It is an arithmetic number, because the mean of its divisors is an integer number (60665607).

Almost surely, 2^121331213 is an apocalyptic number.

It is an amenable number.

121331213 is a deficient number, since it is larger than the sum of its proper divisors (1).

121331213 is an equidigital number, since it uses as much as digits as its factorization.

121331213 is an evil number, because the sum of its binary digits is even.

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

The square root of 121331213 is about 11015.0448478433. The cubic root of 121331213 is about 495.0596302683.

Adding to 121331213 its reverse (312133121), we get a palindrome (433464334).

It can be divided in two parts, 12133121 and 3, that multiplied together give a palindrome (36399363).

The spelling of 121331213 in words is "one hundred twenty-one million, three hundred thirty-one thousand, two hundred thirteen".