221684716 has 12 divisors (see below), whose sum is σ = 423216360. Its totient is φ = 100765760.

The previous prime is 221684711. The next prime is 221684719. The reversal of 221684716 is 617486122.

It is a super-2 number, since 2×221684716² = 98288226616001312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221684711) 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, 2519101 + ... + 2519188.

It is an arithmetic number, because the mean of its divisors is an integer number (35268030).

Almost surely, 2^221684716 is an apocalyptic number.

It is an amenable number.

221684716 is a deficient number, since it is larger than the sum of its proper divisors (201531644).

221684716 is a wasteful number, since it uses less digits than its factorization.

221684716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5038304 (or 5038302 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 221684716 is about 14889.0804282870. The cubic root of 221684716 is about 605.2181131926.

The spelling of 221684716 in words is "two hundred twenty-one million, six hundred eighty-four thousand, seven hundred sixteen".