21131312837471 has 2 divisors, whose sum is σ = 21131312837472. Its totient is φ = 21131312837470.

The previous prime is 21131312837443. The next prime is 21131312837507. The reversal of 21131312837471 is 17473821313112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21131312837471 - 2⁶ = 21131312837407 is a prime.

It is a super-3 number, since 3×21131312837471³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131312887471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565656418735 + 10565656418736.

It is an arithmetic number, because the mean of its divisors is an integer number (10565656418736).

Almost surely, 2^{21131312837471} is an apocalyptic number.

21131312837471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131312837471 is an equidigital number, since it uses as much as digits as its factorization.

21131312837471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The spelling of 21131312837471 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred twelve million, eight hundred thirty-seven thousand, four hundred seventy-one".