121415998 has 12 divisors (see below), whose sum is σ = 200186280. Its totient is φ = 55188980.

The previous prime is 121415971. The next prime is 121416007. The reversal of 121415998 is 899514121.

It is a self number, because there is not a number n which added to its sum of digits gives 121415998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 250618 + ... + 251101.

It is an arithmetic number, because the mean of its divisors is an integer number (16682190).

Almost surely, 2^121415998 is an apocalyptic number.

121415998 is a deficient number, since it is larger than the sum of its proper divisors (78770282).

121415998 is a wasteful number, since it uses less digits than its factorization.

121415998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501743 (or 501732 counting only the distinct ones).

The product of its digits is 25920, while the sum is 40.

The square root of 121415998 is about 11018.8927755923. The cubic root of 121415998 is about 495.1749176061.

The spelling of 121415998 in words is "one hundred twenty-one million, four hundred fifteen thousand, nine hundred ninety-eight".