21305424410071 has 2 divisors, whose sum is σ = 21305424410072. Its totient is φ = 21305424410070.

The previous prime is 21305424410029. The next prime is 21305424410107. The reversal of 21305424410071 is 17001442450312.

Together with next prime (21305424410107) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21305424410071 - 2¹³ = 21305424401879 is a prime.

It is a super-2 number, since 2×21305424410071² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21308424410071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652712205035 + 10652712205036.

It is an arithmetic number, because the mean of its divisors is an integer number (10652712205036).

Almost surely, 2^{21305424410071} is an apocalyptic number.

21305424410071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21305424410071 is an equidigital number, since it uses as much as digits as its factorization.

21305424410071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 34.

Adding to 21305424410071 its reverse (17001442450312), we get a palindrome (38306866860383).

The spelling of 21305424410071 in words is "twenty-one trillion, three hundred five billion, four hundred twenty-four million, four hundred ten thousand, seventy-one".