221381728132 has 24 divisors (see below), whose sum is σ = 410425868160. Its totient is φ = 104124132480.

The previous prime is 221381728067. The next prime is 221381728153. The reversal of 221381728132 is 231827183122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 738544 + ... + 994087.

It is an arithmetic number, because the mean of its divisors is an integer number (17101077840).

Almost surely, 2^221381728132 is an apocalyptic number.

It is an amenable number.

221381728132 is a deficient number, since it is larger than the sum of its proper divisors (189044140028).

221381728132 is a wasteful number, since it uses less digits than its factorization.

221381728132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734531 (or 1734529 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The spelling of 221381728132 in words is "two hundred twenty-one billion, three hundred eighty-one million, seven hundred twenty-eight thousand, one hundred thirty-two".