21022163 has 2 divisors, whose sum is σ = 21022164. Its totient is φ = 21022162.

The previous prime is 21022117. The next prime is 21022171. The reversal of 21022163 is 36122012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21022163 - 2¹⁴ = 21005779 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022103) 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, 10511081 + 10511082.

It is an arithmetic number, because the mean of its divisors is an integer number (10511082).

Almost surely, 2^21022163 is an apocalyptic number.

21022163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022163 is an equidigital number, since it uses as much as digits as its factorization.

21022163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21022163 is about 4584.9932388173. The cubic root of 21022163 is about 275.9894407148.

Adding to 21022163 its reverse (36122012), we get a palindrome (57144175).

The spelling of 21022163 in words is "twenty-one million, twenty-two thousand, one hundred sixty-three".