20321131297 has 2 divisors, whose sum is σ = 20321131298. Its totient is φ = 20321131296.

The previous prime is 20321131261. The next prime is 20321131301. The reversal of 20321131297 is 79213112302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12841649041 + 7479482256 = 113321^2 + 86484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321131297 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321131217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160565648 + 10160565649.

It is an arithmetic number, because the mean of its divisors is an integer number (10160565649).

Almost surely, 2^20321131297 is an apocalyptic number.

It is an amenable number.

20321131297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321131297 is an equidigital number, since it uses as much as digits as its factorization.

20321131297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

Adding to 20321131297 its reverse (79213112302), we get a palindrome (99534243599).

The spelling of 20321131297 in words is "twenty billion, three hundred twenty-one million, one hundred thirty-one thousand, two hundred ninety-seven".