21031163 has 2 divisors, whose sum is σ = 21031164. Its totient is φ = 21031162.

The previous prime is 21031151. The next prime is 21031169. The reversal of 21031163 is 36113012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21031163 - 2¹² = 21027067 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21031169) 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 as a sum of consecutive naturals, namely, 10515581 + 10515582.

It is an arithmetic number, because the mean of its divisors is an integer number (10515582).

Almost surely, 2^21031163 is an apocalyptic number.

21031163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031163 is an equidigital number, since it uses as much as digits as its factorization.

21031163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21031163 is about 4585.9745965280. The cubic root of 21031163 is about 276.0288205919.

Adding to 21031163 its reverse (36113012), we get a palindrome (57144175).

The spelling of 21031163 in words is "twenty-one million, thirty-one thousand, one hundred sixty-three".