221595028 has 12 divisors (see below), whose sum is σ = 388173940. Its totient is φ = 110688192.

The previous prime is 221595007. The next prime is 221595029. The reversal of 221595028 is 820595122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 211935364 + 9659664 = 14558^2 + 3108^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 221594984 and 221595002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221595029) 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 3 ways as a sum of consecutive naturals, for example, 22683 + ... + 30946.

Almost surely, 2^221595028 is an apocalyptic number.

It is an amenable number.

221595028 is a deficient number, since it is larger than the sum of its proper divisors (166578912).

221595028 is a wasteful number, since it uses less digits than its factorization.

221595028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54666 (or 54664 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 221595028 is about 14886.0682518924. The cubic root of 221595028 is about 605.1364835627.

The spelling of 221595028 in words is "two hundred twenty-one million, five hundred ninety-five thousand, twenty-eight".