121155205 has 16 divisors (see below), whose sum is σ = 152967024. Its totient is φ = 91998720.

The previous prime is 121155193. The next prime is 121155227. The reversal of 121155205 is 502551121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1156 + 121154049 = 34^2 + 11007^2 .

It is not a de Polignac number, because 121155205 - 2¹⁷ = 121024133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402 + ... + 15571.

It is an arithmetic number, because the mean of its divisors is an integer number (9560439).

Almost surely, 2^121155205 is an apocalyptic number.

It is an amenable number.

121155205 is a deficient number, since it is larger than the sum of its proper divisors (31811819).

121155205 is a wasteful number, since it uses less digits than its factorization.

121155205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16056.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 121155205 is about 11007.0525119125. The cubic root of 121155205 is about 494.8201298660.

The spelling of 121155205 in words is "one hundred twenty-one million, one hundred fifty-five thousand, two hundred five".