21753163 has 2 divisors, whose sum is σ = 21753164. Its totient is φ = 21753162.

The previous prime is 21753131. The next prime is 21753167. The reversal of 21753163 is 36135712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21753163 - 2⁵ = 21753131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21753167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876581 + 10876582.

It is an arithmetic number, because the mean of its divisors is an integer number (10876582).

Almost surely, 2^21753163 is an apocalyptic number.

21753163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21753163 is an equidigital number, since it uses as much as digits as its factorization.

21753163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 28.

The square root of 21753163 is about 4664.0286234113. The cubic root of 21753163 is about 279.1520391930.

Adding to 21753163 its reverse (36135712), we get a palindrome (57888875).

The spelling of 21753163 in words is "twenty-one million, seven hundred fifty-three thousand, one hundred sixty-three".