121471209 has 12 divisors (see below), whose sum is σ = 175558656. Its totient is φ = 80934552.

The previous prime is 121471193. The next prime is 121471213. The reversal of 121471209 is 902174121.

It is not a de Polignac number, because 121471209 - 2⁴ = 121471193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121471219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21672 + ... + 26694.

It is an arithmetic number, because the mean of its divisors is an integer number (14629888).

Almost surely, 2^121471209 is an apocalyptic number.

It is an amenable number.

121471209 is a deficient number, since it is larger than the sum of its proper divisors (54087447).

121471209 is a wasteful number, since it uses less digits than its factorization.

121471209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7716 (or 7713 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 121471209 is about 11021.3977788663. The cubic root of 121471209 is about 495.2499625204.

The spelling of 121471209 in words is "one hundred twenty-one million, four hundred seventy-one thousand, two hundred nine".