21322163 has 4 divisors (see below), whose sum is σ = 22057440. Its totient is φ = 20586888.

The previous prime is 21322139. The next prime is 21322181. The reversal of 21322163 is 36122312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21322163 - 2⁶ = 21322099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21322463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367595 + ... + 367652.

It is an arithmetic number, because the mean of its divisors is an integer number (5514360).

Almost surely, 2^21322163 is an apocalyptic number.

21322163 is a deficient number, since it is larger than the sum of its proper divisors (735277).

21322163 is an equidigital number, since it uses as much as digits as its factorization.

21322163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735276.

The product of its digits is 432, while the sum is 20.

The square root of 21322163 is about 4617.5927711309. The cubic root of 21322163 is about 277.2960945606.

Adding to 21322163 its reverse (36122312), we get a palindrome (57444475).

The spelling of 21322163 in words is "twenty-one million, three hundred twenty-two thousand, one hundred sixty-three".