121775213 has 4 divisors (see below), whose sum is σ = 139171680. Its totient is φ = 104378748.

The previous prime is 121775191. The next prime is 121775243. The reversal of 121775213 is 312577121.

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 121775213 - 2⁸ = 121774957 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 (121775243) 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, 8698223 + ... + 8698236.

It is an arithmetic number, because the mean of its divisors is an integer number (34792920).

Almost surely, 2^121775213 is an apocalyptic number.

It is an amenable number.

121775213 is a deficient number, since it is larger than the sum of its proper divisors (17396467).

121775213 is an equidigital number, since it uses as much as digits as its factorization.

121775213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17396466.

The product of its digits is 2940, while the sum is 29.

The square root of 121775213 is about 11035.1806963004. The cubic root of 121775213 is about 495.6627696526.

The spelling of 121775213 in words is "one hundred twenty-one million, seven hundred seventy-five thousand, two hundred thirteen".