221573216 has 12 divisors (see below), whose sum is σ = 436222332. Its totient is φ = 110786592.

The previous prime is 221573207. The next prime is 221573249. The reversal of 221573216 is 612375122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3462050 + ... + 3462113.

It is an arithmetic number, because the mean of its divisors is an integer number (36351861).

Almost surely, 2^221573216 is an apocalyptic number.

It is an amenable number.

221573216 is a deficient number, since it is larger than the sum of its proper divisors (214649116).

221573216 is an equidigital number, since it uses as much as digits as its factorization.

221573216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6924173 (or 6924165 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 221573216 is about 14885.3356025318. The cubic root of 221573216 is about 605.1166280178.

The spelling of 221573216 in words is "two hundred twenty-one million, five hundred seventy-three thousand, two hundred sixteen".