221516 has 12 divisors (see below), whose sum is σ = 393120. Its totient is φ = 109200.

The previous prime is 221509. The next prime is 221537. The reversal of 221516 is 615122.

It is a junction number, because it is equal to n+sod(n) for n = 221494 and 221503.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221516.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 666.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2²²¹⁵¹⁶ is an apocalyptic number.

It is an amenable number.

221516 is a deficient number, since it is larger than the sum of its proper divisors (171604).

221516 is a wasteful number, since it uses less digits than its factorization.

221516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784 (or 782 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 221516 is about 470.6548629304. The cubic root of 221516 is about 60.5064537887.

Adding to 221516 its reverse (615122), we get a palindrome (836638).

It can be divided in two parts, 221 and 516, that added together give a palindrome (737).

The spelling of 221516 in words is "two hundred twenty-one thousand, five hundred sixteen".