225721219 has 2 divisors, whose sum is σ = 225721220. Its totient is φ = 225721218.

The previous prime is 225721217. The next prime is 225721247. The reversal of 225721219 is 912127522.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 225721219 - 2¹ = 225721217 is a prime.

It is a super-2 number, since 2×225721219² = 101900137413691922, which contains 22 as substring.

Together with 225721217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (225721211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112860609 + 112860610.

It is an arithmetic number, because the mean of its divisors is an integer number (112860610).

Almost surely, 2^225721219 is an apocalyptic number.

225721219 is a deficient number, since it is larger than the sum of its proper divisors (1).

225721219 is an equidigital number, since it uses as much as digits as its factorization.

225721219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 225721219 is about 15024.0213990795. The cubic root of 225721219 is about 608.8693730400.

The spelling of 225721219 in words is "two hundred twenty-five million, seven hundred twenty-one thousand, two hundred nineteen".