221019216 has 40 divisors (see below), whose sum is σ = 622873824. Its totient is φ = 66975360.

The previous prime is 221019173. The next prime is 221019217. The reversal of 221019216 is 612910122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221019217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208771 + ... + 209826.

Almost surely, 2^221019216 is an apocalyptic number.

It is an amenable number.

221019216 is an abundant number, since it is smaller than the sum of its proper divisors (401854608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221019216 is a wasteful number, since it uses less digits than its factorization.

221019216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418619 (or 418613 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 221019216 is about 14866.7150372905. The cubic root of 221019216 is about 604.6118822988.

Adding to 221019216 its reverse (612910122), we get a palindrome (833929338).

The spelling of 221019216 in words is "two hundred twenty-one million, nineteen thousand, two hundred sixteen".