121656208 has 40 divisors (see below), whose sum is σ = 241155200. Its totient is φ = 59439744.

The previous prime is 121656187. The next prime is 121656209. The reversal of 121656208 is 802656121.

It is a self number, because there is not a number n which added to its sum of digits gives 121656208.

It is not an unprimeable number, because it can be changed into a prime (121656209) 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, 137335 + ... + 138217.

It is an arithmetic number, because the mean of its divisors is an integer number (6028880).

Almost surely, 2^121656208 is an apocalyptic number.

It is an amenable number.

121656208 is a deficient number, since it is larger than the sum of its proper divisors (119498992).

121656208 is a wasteful number, since it uses less digits than its factorization.

121656208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 121656208 is about 11029.7873052929. The cubic root of 121656208 is about 495.5012546455.

The spelling of 121656208 in words is "one hundred twenty-one million, six hundred fifty-six thousand, two hundred eight".