221166210 has 32 divisors (see below), whose sum is σ = 531819072. Its totient is φ = 58864320.

The previous prime is 221166193. The next prime is 221166221. The reversal of 221166210 is 12661122.

221166210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9417 + ... + 23043.

It is an arithmetic number, because the mean of its divisors is an integer number (16619346).

Almost surely, 2^221166210 is an apocalyptic number.

221166210 is an abundant number, since it is smaller than the sum of its proper divisors (310652862).

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

221166210 is a wasteful number, since it uses less digits than its factorization.

221166210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14178.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 221166210 is about 14871.6579438878. The cubic root of 221166210 is about 604.7458896871.

The spelling of 221166210 in words is "two hundred twenty-one million, one hundred sixty-six thousand, two hundred ten".