20211110071 has 2 divisors, whose sum is σ = 20211110072. Its totient is φ = 20211110070.

The previous prime is 20211110069. The next prime is 20211110107. The reversal of 20211110071 is 17001111202.

Together with next prime (20211110107) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211110071 - 2¹ = 20211110069 is a prime.

Together with 20211110069, 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 (20211117071) 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, 10105555035 + 10105555036.

It is an arithmetic number, because the mean of its divisors is an integer number (10105555036).

Almost surely, 2^20211110071 is an apocalyptic number.

20211110071 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211110071 is an equidigital number, since it uses as much as digits as its factorization.

20211110071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 20211110071 its reverse (17001111202), we get a palindrome (37212221273).

The spelling of 20211110071 in words is "twenty billion, two hundred eleven million, one hundred ten thousand, seventy-one".