221320188 has 30 divisors (see below), whose sum is σ = 578575536. Its totient is φ = 73773288.

The previous prime is 221320163. The next prime is 221320193. The reversal of 221320188 is 881023122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 341220 + ... + 341867.

Almost surely, 2^221320188 is an apocalyptic number.

It is an amenable number.

221320188 is an abundant number, since it is smaller than the sum of its proper divisors (357255348).

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

221320188 is a wasteful number, since it uses less digits than its factorization.

221320188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683103 (or 683092 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 221320188 is about 14876.8339373672. The cubic root of 221320188 is about 604.8862003930.

The spelling of 221320188 in words is "two hundred twenty-one million, three hundred twenty thousand, one hundred eighty-eight".