221296 has 10 divisors (see below), whose sum is σ = 428792. Its totient is φ = 110640.

The previous prime is 221281. The next prime is 221303. The reversal of 221296 is 692122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

221296 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6900 + ... + 6931.

2²²¹²⁹⁶ is an apocalyptic number.

It is an amenable number.

221296 is a deficient number, since it is larger than the sum of its proper divisors (207496).

221296 is a wasteful number, since it uses less digits than its factorization.

221296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13839 (or 13833 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 221296 is about 470.4210879627. The cubic root of 221296 is about 60.4864163662.

The spelling of 221296 in words is "two hundred twenty-one thousand, two hundred ninety-six".