221646716 has 12 divisors (see below), whose sum is σ = 394456440. Its totient is φ = 108944880.

The previous prime is 221646713. The next prime is 221646721. The reversal of 221646716 is 617646122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221646713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469355 + ... + 469826.

It is an arithmetic number, because the mean of its divisors is an integer number (32871370).

Almost surely, 2^221646716 is an apocalyptic number.

It is an amenable number.

221646716 is a deficient number, since it is larger than the sum of its proper divisors (172809724).

221646716 is a wasteful number, since it uses less digits than its factorization.

221646716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939244 (or 939242 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 221646716 is about 14887.8042706102. The cubic root of 221646716 is about 605.1835301401.

The spelling of 221646716 in words is "two hundred twenty-one million, six hundred forty-six thousand, seven hundred sixteen".