221202189 has 12 divisors (see below), whose sum is σ = 344092476. Its totient is φ = 136124352.

The previous prime is 221202187. The next prime is 221202203. The reversal of 221202189 is 981202122.

It can be written as a sum of positive squares in 2 ways, for example, as 93896100 + 127306089 = 9690^2 + 11283^2 .

It is not a de Polignac number, because 221202189 - 2¹ = 221202187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221202187) 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, 945192 + ... + 945425.

It is an arithmetic number, because the mean of its divisors is an integer number (28674373).

Almost surely, 2^221202189 is an apocalyptic number.

It is an amenable number.

221202189 is a deficient number, since it is larger than the sum of its proper divisors (122890287).

221202189 is a wasteful number, since it uses less digits than its factorization.

221202189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1890636 (or 1890633 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 221202189 is about 14872.8675446264. The cubic root of 221202189 is about 604.7786809720.

The spelling of 221202189 in words is "two hundred twenty-one million, two hundred two thousand, one hundred eighty-nine".