121604816 has 20 divisors (see below), whose sum is σ = 243210624. Its totient is φ = 58840800.

The previous prime is 121604809. The next prime is 121604851. The reversal of 121604816 is 618406121.

121604816 is an admirable number.

It is a congruent number.

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, 122090 + ... + 123081.

Almost surely, 2^121604816 is an apocalyptic number.

121604816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121604816 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121604816 is a wasteful number, since it uses less digits than its factorization.

121604816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245210 (or 245204 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 121604816 is about 11027.4573678614. The cubic root of 121604816 is about 495.4314722440.

The spelling of 121604816 in words is "one hundred twenty-one million, six hundred four thousand, eight hundred sixteen".