21130320331 has 2 divisors, whose sum is σ = 21130320332. Its totient is φ = 21130320330.

The previous prime is 21130320283. The next prime is 21130320353. The reversal of 21130320331 is 13302303112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21130320331 - 2⁷ = 21130320203 is a prime.

It is a super-2 number, since 2×21130320331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21130320299 and 21130320308.

It is not a weakly prime, because it can be changed into another prime (21130320361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565160165 + 10565160166.

It is an arithmetic number, because the mean of its divisors is an integer number (10565160166).

Almost surely, 2^21130320331 is an apocalyptic number.

21130320331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130320331 is an equidigital number, since it uses as much as digits as its factorization.

21130320331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21130320331 its reverse (13302303112), we get a palindrome (34432623443).

The spelling of 21130320331 in words is "twenty-one billion, one hundred thirty million, three hundred twenty thousand, three hundred thirty-one".