221326099 has 4 divisors (see below), whose sum is σ = 224443440. Its totient is φ = 218208760.

The previous prime is 221326069. The next prime is 221326109. The reversal of 221326099 is 990623122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221326099 - 2⁵ = 221326067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221326069) 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, 1558564 + ... + 1558705.

It is an arithmetic number, because the mean of its divisors is an integer number (56110860).

Almost surely, 2^221326099 is an apocalyptic number.

221326099 is a deficient number, since it is larger than the sum of its proper divisors (3117341).

221326099 is an equidigital number, since it uses as much as digits as its factorization.

221326099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117340.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 221326099 is about 14877.0326006230. The cubic root of 221326099 is about 604.8915854275.

The spelling of 221326099 in words is "two hundred twenty-one million, three hundred twenty-six thousand, ninety-nine".