121252145 has 32 divisors (see below), whose sum is σ = 172550400. Its totient is φ = 80061696.

The previous prime is 121252099. The next prime is 121252147. The reversal of 121252145 is 541252121.

It is a cyclic number.

It is not a de Polignac number, because 121252145 - 2²⁶ = 54143281 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121252145.

It is not an unprimeable number, because it can be changed into a prime (121252147) 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 31 ways as a sum of consecutive naturals, for example, 140726 + ... + 141584.

It is an arithmetic number, because the mean of its divisors is an integer number (5392200).

Almost surely, 2^121252145 is an apocalyptic number.

It is an amenable number.

121252145 is a deficient number, since it is larger than the sum of its proper divisors (51298255).

121252145 is a wasteful number, since it uses less digits than its factorization.

121252145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017.

The product of its digits is 800, while the sum is 23.

The square root of 121252145 is about 11011.4551717745. The cubic root of 121252145 is about 494.9520682766.

The spelling of 121252145 in words is "one hundred twenty-one million, two hundred fifty-two thousand, one hundred forty-five".