21321011431471 has 2 divisors, whose sum is σ = 21321011431472. Its totient is φ = 21321011431470.

The previous prime is 21321011431469. The next prime is 21321011431519. The reversal of 21321011431471 is 17413411012312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21321011431471 - 2¹ = 21321011431469 is a prime.

It is a super-3 number, since 3×21321011431471³ (a number of 41 digits) contains 333 as substring.

Together with 21321011431469, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321011431871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660505715735 + 10660505715736.

It is an arithmetic number, because the mean of its divisors is an integer number (10660505715736).

Almost surely, 2^{21321011431471} is an apocalyptic number.

21321011431471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321011431471 is an equidigital number, since it uses as much as digits as its factorization.

21321011431471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 21321011431471 its reverse (17413411012312), we get a palindrome (38734422443783).

The spelling of 21321011431471 in words is "twenty-one trillion, three hundred twenty-one billion, eleven million, four hundred thirty-one thousand, four hundred seventy-one".