21632323231 has 2 divisors, whose sum is σ = 21632323232. Its totient is φ = 21632323230.

The previous prime is 21632323211. The next prime is 21632323253. The reversal of 21632323231 is 13232323612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21632323231 - 2¹⁹ = 21631798943 is a prime.

It is a super-2 number, since 2×21632323231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21632323231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21632323211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10816161615 + 10816161616.

It is an arithmetic number, because the mean of its divisors is an integer number (10816161616).

Almost surely, 2^21632323231 is an apocalyptic number.

21632323231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21632323231 is an equidigital number, since it uses as much as digits as its factorization.

21632323231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 28.

Adding to 21632323231 its reverse (13232323612), we get a palindrome (34864646843).

The spelling of 21632323231 in words is "twenty-one billion, six hundred thirty-two million, three hundred twenty-three thousand, two hundred thirty-one".