21153163 has 2 divisors, whose sum is σ = 21153164. Its totient is φ = 21153162.

The previous prime is 21153161. The next prime is 21153199. The reversal of 21153163 is 36135112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21153163 - 2¹ = 21153161 is a prime.

Together with 21153161, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21153161) 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, 10576581 + 10576582.

It is an arithmetic number, because the mean of its divisors is an integer number (10576582).

Almost surely, 2^21153163 is an apocalyptic number.

21153163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21153163 is an equidigital number, since it uses as much as digits as its factorization.

21153163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 22.

The square root of 21153163 is about 4599.2567877865. The cubic root of 21153163 is about 276.5615318021.

Adding to 21153163 its reverse (36135112), we get a palindrome (57288275).

It can be divided in two parts, 21153 and 163, that added together give a square (21316 = 146²).

The spelling of 21153163 in words is "twenty-one million, one hundred fifty-three thousand, one hundred sixty-three".