21232123163 has 2 divisors, whose sum is σ = 21232123164. Its totient is φ = 21232123162.

The previous prime is 21232123151. The next prime is 21232123207. The reversal of 21232123163 is 36132123212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21232123163 - 2²⁰ = 21231074587 is a prime.

It is a super-2 number, since 2×21232123163² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21232123063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616061581 + 10616061582.

It is an arithmetic number, because the mean of its divisors is an integer number (10616061582).

Almost surely, 2^21232123163 is an apocalyptic number.

21232123163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232123163 is an equidigital number, since it uses as much as digits as its factorization.

21232123163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

Adding to 21232123163 its reverse (36132123212), we get a palindrome (57364246375).

The spelling of 21232123163 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, one hundred sixty-three".