20131023211331 has 2 divisors, whose sum is σ = 20131023211332. Its totient is φ = 20131023211330.

The previous prime is 20131023211297. The next prime is 20131023211363. The reversal of 20131023211331 is 13311232013102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20131023211331 is a prime.

It is a super-2 number, since 2×20131023211331² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20131023211297 and 20131023211306.

It is not a weakly prime, because it can be changed into another prime (20131023211391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065511605665 + 10065511605666.

It is an arithmetic number, because the mean of its divisors is an integer number (10065511605666).

Almost surely, 2^{20131023211331} is an apocalyptic number.

20131023211331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131023211331 is an equidigital number, since it uses as much as digits as its factorization.

20131023211331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 20131023211331 its reverse (13311232013102), we get a palindrome (33442255224433).

The spelling of 20131023211331 in words is "twenty trillion, one hundred thirty-one billion, twenty-three million, two hundred eleven thousand, three hundred thirty-one".