121808900 has 18 divisors (see below), whose sum is σ = 264325530. Its totient is φ = 48723520.

The previous prime is 121808857. The next prime is 121808923. The reversal of 121808900 is 9808121.

It can be written as a sum of positive squares in 3 ways, for example, as 5125696 + 116683204 = 2264^2 + 10802^2 .

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, 608945 + ... + 609144.

Almost surely, 2^121808900 is an apocalyptic number.

121808900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121808900 is an abundant number, since it is smaller than the sum of its proper divisors (142516630).

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

121808900 is a wasteful number, since it uses less digits than its factorization.

121808900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218103 (or 1218096 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 121808900 is about 11036.7069364009. The cubic root of 121808900 is about 495.7084709407.

The spelling of 121808900 in words is "one hundred twenty-one million, eight hundred eight thousand, nine hundred".