221072216 has 32 divisors (see below), whose sum is σ = 440154000. Its totient is φ = 103735296.

The previous prime is 221072209. The next prime is 221072219. The reversal of 221072216 is 612270122.

It is a happy number.

221072216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221072216³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221072191 and 221072200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221072219) 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, 49400 + ... + 53688.

Almost surely, 2^221072216 is an apocalyptic number.

It is an amenable number.

221072216 is a deficient number, since it is larger than the sum of its proper divisors (219081784).

221072216 is a wasteful number, since it uses less digits than its factorization.

221072216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4691 (or 4687 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 221072216 is about 14868.4974358541. The cubic root of 221072216 is about 604.6602067074.

The spelling of 221072216 in words is "two hundred twenty-one million, seventy-two thousand, two hundred sixteen".