121918433 has 16 divisors (see below), whose sum is σ = 150420480. Its totient is φ = 96227136.

The previous prime is 121918411. The next prime is 121918439. The reversal of 121918433 is 334819121.

It is a cyclic number.

It is not a de Polignac number, because 121918433 - 2⁸ = 121918177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121918433.

It is not an unprimeable number, because it can be changed into a prime (121918439) 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, 42191 + ... + 44987.

It is an arithmetic number, because the mean of its divisors is an integer number (9401280).

Almost surely, 2^121918433 is an apocalyptic number.

121918433 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121918433 is a deficient number, since it is larger than the sum of its proper divisors (28502047).

121918433 is a wasteful number, since it uses less digits than its factorization.

121918433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3296.

The product of its digits is 5184, while the sum is 32.

The square root of 121918433 is about 11041.6680352200. The cubic root of 121918433 is about 495.8570100848.

The spelling of 121918433 in words is "one hundred twenty-one million, nine hundred eighteen thousand, four hundred thirty-three".