121666042 has 16 divisors (see below), whose sum is σ = 194245992. Its totient is φ = 56954880.

The previous prime is 121666019. The next prime is 121666043. The reversal of 121666042 is 240666121.

It can be written as a sum of positive squares in 4 ways, for example, as 103612041 + 18054001 = 10179^2 + 4249^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121666042.

It is not an unprimeable number, because it can be changed into a prime (121666043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2709 + ... + 15832.

Almost surely, 2^121666042 is an apocalyptic number.

121666042 is a deficient number, since it is larger than the sum of its proper divisors (72579950).

121666042 is a wasteful number, since it uses less digits than its factorization.

121666042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18753.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 121666042 is about 11030.2330891056. The cubic root of 121666042 is about 495.5146054591.

The spelling of 121666042 in words is "one hundred twenty-one million, six hundred sixty-six thousand, forty-two".