121999958 has 32 divisors (see below), whose sum is σ = 196390656. Its totient is φ = 56710368.

The previous prime is 121999951. The next prime is 121999961. The reversal of 121999958 is 859999121.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121999951) 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 15 ways as a sum of consecutive naturals, for example, 397241 + ... + 397547.

It is an arithmetic number, because the mean of its divisors is an integer number (6137208).

Almost surely, 2^121999958 is an apocalyptic number.

121999958 is a deficient number, since it is larger than the sum of its proper divisors (74390698).

121999958 is a wasteful number, since it uses less digits than its factorization.

121999958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548.

The product of its digits is 524880, while the sum is 53.

The square root of 121999958 is about 11045.3591159364. The cubic root of 121999958 is about 495.9675094699.

The spelling of 121999958 in words is "one hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred fifty-eight".