121155201 has 6 divisors (see below), whose sum is σ = 175001970. Its totient is φ = 80770128.

The previous prime is 121155193. The next prime is 121155227. The reversal of 121155201 is 102551121.

It can be written as a sum of positive squares in only one way, i.e., 110754576 + 10400625 = 10524^2 + 3225^2 .

It is not a de Polignac number, because 121155201 - 2³ = 121155193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121155271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6730836 + ... + 6730853.

It is an arithmetic number, because the mean of its divisors is an integer number (29166995).

Almost surely, 2^121155201 is an apocalyptic number.

It is an amenable number.

121155201 is a deficient number, since it is larger than the sum of its proper divisors (53846769).

121155201 is a wasteful number, since it uses less digits than its factorization.

121155201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13461695 (or 13461692 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 121155201 is about 11007.0523302108. The cubic root of 121155201 is about 494.8201244204.

The spelling of 121155201 in words is "one hundred twenty-one million, one hundred fifty-five thousand, two hundred one".