121755218 has 16 divisors (see below), whose sum is σ = 196863576. Its totient is φ = 56142720.

The previous prime is 121755203. The next prime is 121755223. The reversal of 121755218 is 812557121.

It can be written as a sum of positive squares in 4 ways, for example, as 90763729 + 30991489 = 9527^2 + 5567^2 .

It is a super-2 number, since 2×121755218² = 29648666220455048, 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 7 ways as a sum of consecutive naturals, for example, 52238 + ... + 54518.

Almost surely, 2^121755218 is an apocalyptic number.

121755218 is a deficient number, since it is larger than the sum of its proper divisors (75108358).

121755218 is a wasteful number, since it uses less digits than its factorization.

121755218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4349.

The product of its digits is 5600, while the sum is 32.

The square root of 121755218 is about 11034.2746929737. The cubic root of 121755218 is about 495.6356395569.

The spelling of 121755218 in words is "one hundred twenty-one million, seven hundred fifty-five thousand, two hundred eighteen".