21435163 has 2 divisors, whose sum is σ = 21435164. Its totient is φ = 21435162.

The previous prime is 21435143. The next prime is 21435233. The reversal of 21435163 is 36153412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21435163 is a prime.

It is equal to p_1355722 and since 21435163 and 1355722 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21435133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717581 + 10717582.

It is an arithmetic number, because the mean of its divisors is an integer number (10717582).

Almost surely, 2^21435163 is an apocalyptic number.

21435163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21435163 is an equidigital number, since it uses as much as digits as its factorization.

21435163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 21435163 is about 4629.8124152065. The cubic root of 21435163 is about 277.7850891527.

Adding to 21435163 its reverse (36153412), we get a palindrome (57588575).

The spelling of 21435163 in words is "twenty-one million, four hundred thirty-five thousand, one hundred sixty-three".