121165225 has 12 divisors (see below), whose sum is σ = 150743824. Its totient is φ = 96610320.

The previous prime is 121165217. The next prime is 121165229. The reversal of 121165225 is 522561121.

It is not a de Polignac number, because 121165225 - 2³ = 121165217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121165225.

It is not an unprimeable number, because it can be changed into a prime (121165229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219 + ... + 15568.

Almost surely, 2^121165225 is an apocalyptic number.

It is an amenable number.

121165225 is a deficient number, since it is larger than the sum of its proper divisors (29578599).

121165225 is a wasteful number, since it uses less digits than its factorization.

121165225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16104 (or 16099 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 121165225 is about 11007.5076652256. The cubic root of 121165225 is about 494.8337706639.

The spelling of 121165225 in words is "one hundred twenty-one million, one hundred sixty-five thousand, two hundred twenty-five".