121204189 has 2 divisors, whose sum is σ = 121204190. Its totient is φ = 121204188.

The previous prime is 121204183. The next prime is 121204201. The reversal of 121204189 is 981402121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 55756089 = 8090^2 + 7467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121204189 is a prime.

It is a super-2 number, since 2×121204189² = 29380910862295442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121204183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60602094 + 60602095.

It is an arithmetic number, because the mean of its divisors is an integer number (60602095).

Almost surely, 2^121204189 is an apocalyptic number.

It is an amenable number.

121204189 is a deficient number, since it is larger than the sum of its proper divisors (1).

121204189 is an equidigital number, since it uses as much as digits as its factorization.

121204189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 121204189 is about 11009.2774058973. The cubic root of 121204189 is about 494.8868074343.

The spelling of 121204189 in words is "one hundred twenty-one million, two hundred four thousand, one hundred eighty-nine".