20331311211331 has 2 divisors, whose sum is σ = 20331311211332. Its totient is φ = 20331311211330.

The previous prime is 20331311211301. The next prime is 20331311211353. The reversal of 20331311211331 is 13311211313302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20331311211331 is a prime.

It is a super-2 number, since 2×20331311211331² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20331311211296 and 20331311211305.

It is not a weakly prime, because it can be changed into another prime (20331311211301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165655605665 + 10165655605666.

It is an arithmetic number, because the mean of its divisors is an integer number (10165655605666).

Almost surely, 2^{20331311211331} is an apocalyptic number.

20331311211331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331311211331 is an equidigital number, since it uses as much as digits as its factorization.

20331311211331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 20331311211331 its reverse (13311211313302), we get a palindrome (33642522524633).

The spelling of 20331311211331 in words is "twenty trillion, three hundred thirty-one billion, three hundred eleven million, two hundred eleven thousand, three hundred thirty-one".