121918138 has 8 divisors (see below), whose sum is σ = 185875380. Its totient is φ = 59959680.

The previous prime is 121918129. The next prime is 121918157. The reversal of 121918138 is 831819121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 116143729 + 5774409 = 10777^2 + 2403^2 .

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

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, 499543 + ... + 499786.

Almost surely, 2^121918138 is an apocalyptic number.

121918138 is a deficient number, since it is larger than the sum of its proper divisors (63957242).

121918138 is an equidigital number, since it uses as much as digits as its factorization.

121918138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999392.

The product of its digits is 3456, while the sum is 34.

The square root of 121918138 is about 11041.6546767230. The cubic root of 121918138 is about 495.8566101510.

The spelling of 121918138 in words is "one hundred twenty-one million, nine hundred eighteen thousand, one hundred thirty-eight".