121635856 has 20 divisors (see below), whose sum is σ = 236446672. Its totient is φ = 60617376.

The previous prime is 121635841. The next prime is 121635931. The reversal of 121635856 is 658536121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7470 + ... + 17293.

Almost surely, 2^121635856 is an apocalyptic number.

121635856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121635856 is a deficient number, since it is larger than the sum of its proper divisors (114810816).

121635856 is a wasteful number, since it uses less digits than its factorization.

121635856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25078 (or 25072 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 121635856 is about 11028.8646741176. The cubic root of 121635856 is about 495.4736221224.

The spelling of 121635856 in words is "one hundred twenty-one million, six hundred thirty-five thousand, eight hundred fifty-six".