21131431341133 has 2 divisors, whose sum is σ = 21131431341134. Its totient is φ = 21131431341132.

The previous prime is 21131431341121. The next prime is 21131431341173. The reversal of 21131431341133 is 33114313413112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18867017329924 + 2264414011209 = 4343618^2 + 1504797^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131431341133 - 2¹³ = 21131431332941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21131431341095 and 21131431341104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131431341103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565715670566 + 10565715670567.

It is an arithmetic number, because the mean of its divisors is an integer number (10565715670567).

Almost surely, 2^{21131431341133} is an apocalyptic number.

It is an amenable number.

21131431341133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131431341133 is an equidigital number, since it uses as much as digits as its factorization.

21131431341133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

Adding to 21131431341133 its reverse (33114313413112), we get a palindrome (54245744754245).

The spelling of 21131431341133 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred thirty-one million, three hundred forty-one thousand, one hundred thirty-three".