221256016 has 20 divisors (see below), whose sum is σ = 429492724. Its totient is φ = 110419200.

The previous prime is 221255999. The next prime is 221256017. The reversal of 221256016 is 610652122.

It can be written as a sum of positive squares in 2 ways, for example, as 136983616 + 84272400 = 11704^2 + 9180^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221256017) 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, 4125 + ... + 21436.

Almost surely, 2^221256016 is an apocalyptic number.

It is an amenable number.

221256016 is a deficient number, since it is larger than the sum of its proper divisors (208236708).

221256016 is a wasteful number, since it uses less digits than its factorization.

221256016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26110 (or 26104 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 221256016 is about 14874.6770048966. The cubic root of 221256016 is about 604.8277322978.

The spelling of 221256016 in words is "two hundred twenty-one million, two hundred fifty-six thousand, sixteen".