21107227 has 2 divisors, whose sum is σ = 21107228. Its totient is φ = 21107226.

The previous prime is 21107221. The next prime is 21107239. The reversal of 21107227 is 72270112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21107227 - 2¹¹ = 21105179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21107198 and 21107207.

It is not a weakly prime, because it can be changed into another prime (21107221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553613 + 10553614.

It is an arithmetic number, because the mean of its divisors is an integer number (10553614).

Almost surely, 2^21107227 is an apocalyptic number.

21107227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21107227 is an equidigital number, since it uses as much as digits as its factorization.

21107227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21107227 is about 4594.2602233657. The cubic root of 21107227 is about 276.3611939505.

Adding to 21107227 its reverse (72270112), we get a palindrome (93377339).

The spelling of 21107227 in words is "twenty-one million, one hundred seven thousand, two hundred twenty-seven".