221288219 has 2 divisors, whose sum is σ = 221288220. Its totient is φ = 221288218.

The previous prime is 221288189. The next prime is 221288233. The reversal of 221288219 is 912882122.

221288219 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221288219 is a prime.

It is a super-3 number, since 3×221288219³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (221282219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110644109 + 110644110.

It is an arithmetic number, because the mean of its divisors is an integer number (110644110).

Almost surely, 2^221288219 is an apocalyptic number.

221288219 is a deficient number, since it is larger than the sum of its proper divisors (1).

221288219 is an equidigital number, since it uses as much as digits as its factorization.

221288219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 35.

The square root of 221288219 is about 14875.7594427982. The cubic root of 221288219 is about 604.8570743588.

The spelling of 221288219 in words is "two hundred twenty-one million, two hundred eighty-eight thousand, two hundred nineteen".