21936163 has 2 divisors, whose sum is σ = 21936164. Its totient is φ = 21936162.

The previous prime is 21936157. The next prime is 21936191. The reversal of 21936163 is 36163912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21936163 is a prime.

It is not a weakly prime, because it can be changed into another prime (21936113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968081 + 10968082.

It is an arithmetic number, because the mean of its divisors is an integer number (10968082).

Almost surely, 2^21936163 is an apocalyptic number.

21936163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21936163 is an equidigital number, since it uses as much as digits as its factorization.

21936163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 31.

The square root of 21936163 is about 4683.6057690630. The cubic root of 21936163 is about 279.9326496174.

The spelling of 21936163 in words is "twenty-one million, nine hundred thirty-six thousand, one hundred sixty-three".