221716 has 12 divisors (see below), whose sum is σ = 423360. Its totient is φ = 100760.

The previous prime is 221713. The next prime is 221717. The reversal of 221716 is 617122.

It is a junction number, because it is equal to n+sod(n) for n = 221693 and 221702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2476 + ... + 2563.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2²²¹⁷¹⁶ is an apocalyptic number.

It is an amenable number.

221716 is a deficient number, since it is larger than the sum of its proper divisors (201644).

221716 is a wasteful number, since it uses less digits than its factorization.

221716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5054 (or 5052 counting only the distinct ones).

The product of its digits is 168, while the sum is 19.

The square root of 221716 is about 470.8672849116. The cubic root of 221716 is about 60.5246581180.

Adding to 221716 its reverse (617122), we get a palindrome (838838).

The spelling of 221716 in words is "two hundred twenty-one thousand, seven hundred sixteen".