121766138 has 16 divisors (see below), whose sum is σ = 208270440. Its totient is φ = 52893696.

The previous prime is 121766101. The next prime is 121766159. The reversal of 121766138 is 831667121.

It can be written as a sum of positive squares in 4 ways, for example, as 74252689 + 47513449 = 8617^2 + 6893^2 .

It is a super-4 number, since 4×121766138⁴ (a number of 33 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121766098 and 121766107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137303 + ... + 138186.

Almost surely, 2^121766138 is an apocalyptic number.

121766138 is a deficient number, since it is larger than the sum of its proper divisors (86504302).

121766138 is a wasteful number, since it uses less digits than its factorization.

121766138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275521.

The product of its digits is 12096, while the sum is 35.

The square root of 121766138 is about 11034.7695037096. The cubic root of 121766138 is about 495.6504566614.

The spelling of 121766138 in words is "one hundred twenty-one million, seven hundred sixty-six thousand, one hundred thirty-eight".