221288146 has 16 divisors (see below), whose sum is σ = 334121760. Its totient is φ = 109917280.

The previous prime is 221288143. The next prime is 221288147. The reversal of 221288146 is 641882122.

It is not an unprimeable number, because it can be changed into a prime (221288141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290406 + ... + 291166.

It is an arithmetic number, because the mean of its divisors is an integer number (20882610).

Almost surely, 2^221288146 is an apocalyptic number.

221288146 is a deficient number, since it is larger than the sum of its proper divisors (112833614).

221288146 is a wasteful number, since it uses less digits than its factorization.

221288146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529.

The product of its digits is 12288, while the sum is 34.

The square root of 221288146 is about 14875.7569891418. The cubic root of 221288146 is about 604.8570078474.

The spelling of 221288146 in words is "two hundred twenty-one million, two hundred eighty-eight thousand, one hundred forty-six".