21331132331 has 2 divisors, whose sum is σ = 21331132332. Its totient is φ = 21331132330.

The previous prime is 21331132297. The next prime is 21331132349. The reversal of 21331132331 is 13323113312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21331132331 - 2⁶ = 21331132267 is a prime.

It is a super-2 number, since 2×21331132331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21331132297 and 21331132306.

It is not a weakly prime, because it can be changed into another prime (21331132391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665566165 + 10665566166.

It is an arithmetic number, because the mean of its divisors is an integer number (10665566166).

Almost surely, 2^21331132331 is an apocalyptic number.

21331132331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331132331 is an equidigital number, since it uses as much as digits as its factorization.

21331132331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 23.

Adding to 21331132331 its reverse (13323113312), we get a palindrome (34654245643).

The spelling of 21331132331 in words is "twenty-one billion, three hundred thirty-one million, one hundred thirty-two thousand, three hundred thirty-one".