221336909 has 8 divisors (see below), whose sum is σ = 233123040. Its totient is φ = 209564496.

The previous prime is 221336897. The next prime is 221336911. The reversal of 221336909 is 909633122.

221336909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221336909 - 2⁸ = 221336653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221336989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59039 + ... + 62675.

It is an arithmetic number, because the mean of its divisors is an integer number (29140380).

Almost surely, 2^221336909 is an apocalyptic number.

It is an amenable number.

221336909 is a deficient number, since it is larger than the sum of its proper divisors (11786131).

221336909 is a wasteful number, since it uses less digits than its factorization.

221336909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6859.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 221336909 is about 14877.3959078866. The cubic root of 221336909 is about 604.9014332969.

The spelling of 221336909 in words is "two hundred twenty-one million, three hundred thirty-six thousand, nine hundred nine".