21131411471 has 2 divisors, whose sum is σ = 21131411472. Its totient is φ = 21131411470.

The previous prime is 21131411419. The next prime is 21131411479. The reversal of 21131411471 is 17411413112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21131411471 - 2²⁶ = 21064302607 is a prime.

It is a super-3 number, since 3×21131411471³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21131411471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131411479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565705735 + 10565705736.

It is an arithmetic number, because the mean of its divisors is an integer number (10565705736).

Almost surely, 2^21131411471 is an apocalyptic number.

21131411471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131411471 is an equidigital number, since it uses as much as digits as its factorization.

21131411471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 26.

Adding to 21131411471 its reverse (17411413112), we get a palindrome (38542824583).

The spelling of 21131411471 in words is "twenty-one billion, one hundred thirty-one million, four hundred eleven thousand, four hundred seventy-one".