121999975 has 12 divisors (see below), whose sum is σ = 151703584. Its totient is φ = 97326720.

The previous prime is 121999967. The next prime is 121999991. The reversal of 121999975 is 579999121.

It is a happy number.

It is not a de Polignac number, because 121999975 - 2³ = 121999967 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 11 ways as a sum of consecutive naturals, for example, 2527 + ... + 15823.

Almost surely, 2^121999975 is an apocalyptic number.

121999975 is a deficient number, since it is larger than the sum of its proper divisors (29703609).

121999975 is a wasteful number, since it uses less digits than its factorization.

121999975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13674 (or 13669 counting only the distinct ones).

The product of its digits is 459270, while the sum is 52.

The square root of 121999975 is about 11045.3598854904. The cubic root of 121999975 is about 495.9675325067.

The spelling of 121999975 in words is "one hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred seventy-five".