121255213 has 4 divisors (see below), whose sum is σ = 121580668. Its totient is φ = 120929760.

The previous prime is 121255201. The next prime is 121255217. The reversal of 121255213 is 312552121.

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 71876484 + 49378729 = 8478^2 + 7027^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121255213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121255217) 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, 162168 + ... + 162913.

It is an arithmetic number, because the mean of its divisors is an integer number (30395167).

Almost surely, 2^121255213 is an apocalyptic number.

It is an amenable number.

121255213 is a deficient number, since it is larger than the sum of its proper divisors (325455).

121255213 is an equidigital number, since it uses as much as digits as its factorization.

121255213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325454.

The product of its digits is 600, while the sum is 22.

The square root of 121255213 is about 11011.5944803648. The cubic root of 121255213 is about 494.9562427735.

The spelling of 121255213 in words is "one hundred twenty-one million, two hundred fifty-five thousand, two hundred thirteen".