221236016 has 20 divisors (see below), whose sum is σ = 430540152. Its totient is φ = 110128896.

The previous prime is 221236013. The next prime is 221236021. The reversal of 221236016 is 610632122.

It is a junction number, because it is equal to n+sod(n) for n = 221235982 and 221236000.

It is not an unprimeable number, because it can be changed into a prime (221236013) 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, 26825 + ... + 34088.

Almost surely, 2^221236016 is an apocalyptic number.

It is an amenable number.

221236016 is a deficient number, since it is larger than the sum of its proper divisors (209304136).

221236016 is a wasteful number, since it uses less digits than its factorization.

221236016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61148 (or 61142 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 221236016 is about 14874.0047061980. The cubic root of 221236016 is about 604.8095076797.

Adding to 221236016 its reverse (610632122), we get a palindrome (831868138).

The spelling of 221236016 in words is "two hundred twenty-one million, two hundred thirty-six thousand, sixteen".