221012227 has 2 divisors, whose sum is σ = 221012228. Its totient is φ = 221012226.

The previous prime is 221012201. The next prime is 221012249. The reversal of 221012227 is 722210122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221012227 - 2¹⁵ = 220979459 is a prime.

It is not a weakly prime, because it can be changed into another prime (221012927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506113 + 110506114.

It is an arithmetic number, because the mean of its divisors is an integer number (110506114).

Almost surely, 2^221012227 is an apocalyptic number.

221012227 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012227 is an equidigital number, since it uses as much as digits as its factorization.

221012227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 221012227 is about 14866.4799801432. The cubic root of 221012227 is about 604.6055092829.

Adding to 221012227 its reverse (722210122), we get a palindrome (943222349).

The spelling of 221012227 in words is "two hundred twenty-one million, twelve thousand, two hundred twenty-seven".