21226163 has 6 divisors (see below), whose sum is σ = 24691716. Its totient is φ = 18193812.

The previous prime is 21226157. The next prime is 21226181. The reversal of 21226163 is 36162212.

It is not a de Polignac number, because 21226163 - 2⁴ = 21226147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21226193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216545 + ... + 216642.

It is an arithmetic number, because the mean of its divisors is an integer number (4115286).

Almost surely, 2^21226163 is an apocalyptic number.

21226163 is a deficient number, since it is larger than the sum of its proper divisors (3465553).

21226163 is an equidigital number, since it uses as much as digits as its factorization.

21226163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433201 (or 433194 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 21226163 is about 4607.1860175165. The cubic root of 21226163 is about 276.8793063753.

Adding to 21226163 its reverse (36162212), we get a palindrome (57388375).

The spelling of 21226163 in words is "twenty-one million, two hundred twenty-six thousand, one hundred sixty-three".