121684305 has 16 divisors (see below), whose sum is σ = 199957824. Its totient is φ = 63144000.

The previous prime is 121684289. The next prime is 121684307. The reversal of 121684305 is 503486121.

It is not a de Polignac number, because 121684305 - 2⁴ = 121684289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121684307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109071 + ... + 110180.

It is an arithmetic number, because the mean of its divisors is an integer number (12497364).

Almost surely, 2^121684305 is an apocalyptic number.

121684305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121684305 is a deficient number, since it is larger than the sum of its proper divisors (78273519).

121684305 is a wasteful number, since it uses less digits than its factorization.

121684305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219296.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 121684305 is about 11031.0609190594. The cubic root of 121684305 is about 495.5393977247.

The spelling of 121684305 in words is "one hundred twenty-one million, six hundred eighty-four thousand, three hundred five".