21110227 has 2 divisors, whose sum is σ = 21110228. Its totient is φ = 21110226.

The previous prime is 21110189. The next prime is 21110233. The reversal of 21110227 is 72201112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21110227 - 2⁷ = 21110099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21110227.

It is not a weakly prime, because it can be changed into another prime (21110027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555113 + 10555114.

It is an arithmetic number, because the mean of its divisors is an integer number (10555114).

Almost surely, 2^21110227 is an apocalyptic number.

21110227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110227 is an equidigital number, since it uses as much as digits as its factorization.

21110227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21110227 is about 4594.5867061141. The cubic root of 21110227 is about 276.3742865325.

Adding to 21110227 its reverse (72201112), we get a palindrome (93311339).

The spelling of 21110227 in words is "twenty-one million, one hundred ten thousand, two hundred twenty-seven".