221303016 has 192 divisors, whose sum is σ = 691891200. Its totient is φ = 65707200.

The previous prime is 221303009. The next prime is 221303063. The reversal of 221303016 is 610303122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 221303016.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1689271 + ... + 1689401.

It is an arithmetic number, because the mean of its divisors is an integer number (3603600).

Almost surely, 2^221303016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221303016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345945600).

221303016 is an abundant number, since it is smaller than the sum of its proper divisors (470588184).

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

221303016 is a wasteful number, since it uses less digits than its factorization.

221303016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 221303016 is about 14876.2567872432. The cubic root of 221303016 is about 604.8705558276.

Adding to 221303016 its reverse (610303122), we get a palindrome (831606138).

The spelling of 221303016 in words is "two hundred twenty-one million, three hundred three thousand, sixteen".