20321131331 has 2 divisors, whose sum is σ = 20321131332. Its totient is φ = 20321131330.

The previous prime is 20321131319. The next prime is 20321131349. The reversal of 20321131331 is 13313112302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20321131331 - 2¹⁸ = 20320869187 is a prime.

It is a super-2 number, since 2×20321131331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20321131301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160565665 + 10160565666.

It is an arithmetic number, because the mean of its divisors is an integer number (10160565666).

Almost surely, 2^20321131331 is an apocalyptic number.

20321131331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321131331 is an equidigital number, since it uses as much as digits as its factorization.

20321131331 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 20.

Adding to 20321131331 its reverse (13313112302), we get a palindrome (33634243633).

The spelling of 20321131331 in words is "twenty billion, three hundred twenty-one million, one hundred thirty-one thousand, three hundred thirty-one".