121690856 has 16 divisors (see below), whose sum is σ = 260766240. Its totient is φ = 52153200.

The previous prime is 121690853. The next prime is 121690867. The reversal of 121690856 is 658096121.

It is not an unprimeable number, because it can be changed into a prime (121690853) 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, 1086470 + ... + 1086581.

It is an arithmetic number, because the mean of its divisors is an integer number (16297890).

Almost surely, 2^121690856 is an apocalyptic number.

It is an amenable number.

121690856 is an abundant number, since it is smaller than the sum of its proper divisors (139075384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121690856 is a wasteful number, since it uses less digits than its factorization.

121690856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173064 (or 2173060 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 121690856 is about 11031.3578493312. The cubic root of 121690856 is about 495.5482901899.

The spelling of 121690856 in words is "one hundred twenty-one million, six hundred ninety thousand, eight hundred fifty-six".