21233163 has 16 divisors (see below), whose sum is σ = 33762816. Its totient is φ = 11605440.

The previous prime is 21233161. The next prime is 21233183. The reversal of 21233163 is 36133212.

It is not a de Polignac number, because 21233163 - 2¹ = 21233161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21233161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21498 + ... + 22463.

It is an arithmetic number, because the mean of its divisors is an integer number (2110176).

Almost surely, 2^21233163 is an apocalyptic number.

21233163 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21233163 is a deficient number, since it is larger than the sum of its proper divisors (12529653).

21233163 is a wasteful number, since it uses less digits than its factorization.

21233163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43994.

The product of its digits is 648, while the sum is 21.

The square root of 21233163 is about 4607.9456377002. The cubic root of 21233163 is about 276.9097396058.

Adding to 21233163 its reverse (36133212), we get a palindrome (57366375).

The spelling of 21233163 in words is "twenty-one million, two hundred thirty-three thousand, one hundred sixty-three".