21111163 has 2 divisors, whose sum is σ = 21111164. Its totient is φ = 21111162.

The previous prime is 21111157. The next prime is 21111169. The reversal of 21111163 is 36111112.

It is a balanced prime because it is at equal distance from previous prime (21111157) and next prime (21111169).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111163 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111169) 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, 10555581 + 10555582.

It is an arithmetic number, because the mean of its divisors is an integer number (10555582).

Almost surely, 2^21111163 is an apocalyptic number.

21111163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111163 is an equidigital number, since it uses as much as digits as its factorization.

21111163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 16.

The square root of 21111163 is about 4594.6885639834. The cubic root of 21111163 is about 276.3783711643.

Adding to 21111163 its reverse (36111112), we get a palindrome (57222275).

The spelling of 21111163 in words is "twenty-one million, one hundred eleven thousand, one hundred sixty-three".