121375521 has 12 divisors (see below), whose sum is σ = 177540480. Its totient is φ = 79892280.

The previous prime is 121375519. The next prime is 121375547. The reversal of 121375521 is 125573121.

121375521 is a `hidden beast` number, since 1 + 2 + 137 + 5 + 521 = 666.

It is not a de Polignac number, because 121375521 - 2¹ = 121375519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121375721) 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, 84645 + ... + 86066.

It is an arithmetic number, because the mean of its divisors is an integer number (14795040).

Almost surely, 2^121375521 is an apocalyptic number.

It is an amenable number.

121375521 is a deficient number, since it is larger than the sum of its proper divisors (56164959).

121375521 is a wasteful number, since it uses less digits than its factorization.

121375521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170796 (or 170793 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 121375521 is about 11017.0559134462. The cubic root of 121375521 is about 495.1198852568.

The spelling of 121375521 in words is "one hundred twenty-one million, three hundred seventy-five thousand, five hundred twenty-one".