121218194 has 8 divisors (see below), whose sum is σ = 192523068. Its totient is φ = 57043840.

The previous prime is 121218169. The next prime is 121218199. The reversal of 121218194 is 491812121.

It can be written as a sum of positive squares in 2 ways, for example, as 119617969 + 1600225 = 10937^2 + 1265^2 .

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

It is not an unprimeable number, because it can be changed into a prime (121218199) 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 3 ways as a sum of consecutive naturals, for example, 1782587 + ... + 1782654.

Almost surely, 2^121218194 is an apocalyptic number.

121218194 is a deficient number, since it is larger than the sum of its proper divisors (71304874).

121218194 is a wasteful number, since it uses less digits than its factorization.

121218194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565260.

The product of its digits is 1152, while the sum is 29.

The square root of 121218194 is about 11009.9134419849. The cubic root of 121218194 is about 494.9058678944.

The spelling of 121218194 in words is "one hundred twenty-one million, two hundred eighteen thousand, one hundred ninety-four".