121666826 has 12 divisors (see below), whose sum is σ = 190781682. Its totient is φ = 58187976.

The previous prime is 121666813. The next prime is 121666829. The reversal of 121666826 is 628666121.

It can be written as a sum of positive squares in only one way, i.e., 113401201 + 8265625 = 10649^2 + 2875^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 121666826.

It is not an unprimeable number, because it can be changed into a prime (121666829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56441 + ... + 58556.

Almost surely, 2^121666826 is an apocalyptic number.

121666826 is a deficient number, since it is larger than the sum of its proper divisors (69114856).

121666826 is a wasteful number, since it uses less digits than its factorization.

121666826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115045 (or 115022 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 121666826 is about 11030.2686277352. The cubic root of 121666826 is about 495.5156698005.

The spelling of 121666826 in words is "one hundred twenty-one million, six hundred sixty-six thousand, eight hundred twenty-six".