21220233132331 has 2 divisors, whose sum is σ = 21220233132332. Its totient is φ = 21220233132330.

The previous prime is 21220233132229. The next prime is 21220233132349. The reversal of 21220233132331 is 13323133202212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220233132331 - 2⁹ = 21220233131819 is a prime.

It is a super-2 number, since 2×21220233132331² (a number of 27 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 21220233132331.

It is not a weakly prime, because it can be changed into another prime (21220233132431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610116566165 + 10610116566166.

It is an arithmetic number, because the mean of its divisors is an integer number (10610116566166).

Almost surely, 2^{21220233132331} is an apocalyptic number.

21220233132331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220233132331 is an equidigital number, since it uses as much as digits as its factorization.

21220233132331 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21220233132331 its reverse (13323133202212), we get a palindrome (34543366334543).

The spelling of 21220233132331 in words is "twenty-one trillion, two hundred twenty billion, two hundred thirty-three million, one hundred thirty-two thousand, three hundred thirty-one".