117209221 has 2 divisors, whose sum is σ = 117209222. Its totient is φ = 117209220.

The previous prime is 117209179. The next prime is 117209227. The reversal of 117209221 is 122902711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102232321 + 14976900 = 10111^2 + 3870^2 .

It is a cyclic number.

It is not a de Polignac number, because 117209221 - 2²⁵ = 83654789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117209227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58604610 + 58604611.

It is an arithmetic number, because the mean of its divisors is an integer number (58604611).

Almost surely, 2^117209221 is an apocalyptic number.

It is an amenable number.

117209221 is a deficient number, since it is larger than the sum of its proper divisors (1).

117209221 is an equidigital number, since it uses as much as digits as its factorization.

117209221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 117209221 is about 10826.3207508368. The cubic root of 117209221 is about 489.3886878881.

The spelling of 117209221 in words is "one hundred seventeen million, two hundred nine thousand, two hundred twenty-one".