21320031071 has 2 divisors, whose sum is σ = 21320031072. Its totient is φ = 21320031070.

The previous prime is 21320031013. The next prime is 21320031077. The reversal of 21320031071 is 17013002312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21320031071 - 2¹⁰ = 21320030047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320031077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660015535 + 10660015536.

It is an arithmetic number, because the mean of its divisors is an integer number (10660015536).

Almost surely, 2^21320031071 is an apocalyptic number.

21320031071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320031071 is an equidigital number, since it uses as much as digits as its factorization.

21320031071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

Adding to 21320031071 its reverse (17013002312), we get a palindrome (38333033383).

The spelling of 21320031071 in words is "twenty-one billion, three hundred twenty million, thirty-one thousand, seventy-one".