21231333163 has 2 divisors, whose sum is σ = 21231333164. Its totient is φ = 21231333162.

The previous prime is 21231333121. The next prime is 21231333169. The reversal of 21231333163 is 36133313212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21231333163 - 2²⁹ = 20694462251 is a prime.

It is not a weakly prime, because it can be changed into another prime (21231333169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615666581 + 10615666582.

It is an arithmetic number, because the mean of its divisors is an integer number (10615666582).

Almost surely, 2^21231333163 is an apocalyptic number.

21231333163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231333163 is an equidigital number, since it uses as much as digits as its factorization.

21231333163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 28.

Adding to 21231333163 its reverse (36133313212), we get a palindrome (57364646375).

The spelling of 21231333163 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-three thousand, one hundred sixty-three".