121917818 has 8 divisors (see below), whose sum is σ = 199501920. Its totient is φ = 55417180.

The previous prime is 121917797. The next prime is 121917821. The reversal of 121917818 is 818719121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×121917818² = 29727908691762248, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2770838 + ... + 2770881.

It is an arithmetic number, because the mean of its divisors is an integer number (24937740).

Almost surely, 2^121917818 is an apocalyptic number.

121917818 is a deficient number, since it is larger than the sum of its proper divisors (77584102).

121917818 is a wasteful number, since it uses less digits than its factorization.

121917818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5541732.

The product of its digits is 8064, while the sum is 38.

The square root of 121917818 is about 11041.6401861318. The cubic root of 121917818 is about 495.8561763237.

The spelling of 121917818 in words is "one hundred twenty-one million, nine hundred seventeen thousand, eight hundred eighteen".