21162163 has 4 divisors (see below), whose sum is σ = 23086008. Its totient is φ = 19238320.

The previous prime is 21162157. The next prime is 21162203. The reversal of 21162163 is 36126112.

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 21162163 - 2⁵ = 21162131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21162763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961906 + ... + 961927.

It is an arithmetic number, because the mean of its divisors is an integer number (5771502).

Almost surely, 2^21162163 is an apocalyptic number.

21162163 is a deficient number, since it is larger than the sum of its proper divisors (1923845).

21162163 is a wasteful number, since it uses less digits than its factorization.

21162163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923844.

The product of its digits is 432, while the sum is 22.

The square root of 21162163 is about 4600.2351026877. The cubic root of 21162163 is about 276.6007489610.

Adding to 21162163 its reverse (36126112), we get a palindrome (57288275).

The spelling of 21162163 in words is "twenty-one million, one hundred sixty-two thousand, one hundred sixty-three".