121185221 has 4 divisors (see below), whose sum is σ = 121211532. Its totient is φ = 121158912.

The previous prime is 121185203. The next prime is 121185227. The reversal of 121185221 is 122581121.

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 25908100 + 95277121 = 5090^2 + 9761^2 .

It is a cyclic number.

It is not a de Polignac number, because 121185221 - 2¹⁰ = 121184197 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 (121185227) 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, 4226 + ... + 16131.

It is an arithmetic number, because the mean of its divisors is an integer number (30302883).

Almost surely, 2^121185221 is an apocalyptic number.

It is an amenable number.

121185221 is a deficient number, since it is larger than the sum of its proper divisors (26311).

121185221 is an equidigital number, since it uses as much as digits as its factorization.

121185221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26310.

The product of its digits is 320, while the sum is 23.

The square root of 121185221 is about 11008.4159169247. The cubic root of 121185221 is about 494.8609901125.

The spelling of 121185221 in words is "one hundred twenty-one million, one hundred eighty-five thousand, two hundred twenty-one".