121505205 has 32 divisors (see below), whose sum is σ = 214804224. Its totient is φ = 58336256.

The previous prime is 121505191. The next prime is 121505227. The reversal of 121505205 is 502505121.

It is a cyclic number.

It is not a de Polignac number, because 121505205 - 2⁶ = 121505141 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4494 + ... + 16223.

It is an arithmetic number, because the mean of its divisors is an integer number (6712632).

Almost surely, 2^121505205 is an apocalyptic number.

121505205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121505205 is a deficient number, since it is larger than the sum of its proper divisors (93299019).

121505205 is a wasteful number, since it uses less digits than its factorization.

121505205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20765.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 121505205 is about 11022.9399435904. The cubic root of 121505205 is about 495.2961598798.

The spelling of 121505205 in words is "one hundred twenty-one million, five hundred five thousand, two hundred five".