20021080111 has 2 divisors, whose sum is σ = 20021080112. Its totient is φ = 20021080110.

The previous prime is 20021080109. The next prime is 20021080133. The reversal of 20021080111 is 11108012002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021080111 - 2¹ = 20021080109 is a prime.

It is a super-2 number, since 2×20021080111² (a number of 21 digits) contains 22 as substring.

Together with 20021080109, 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 (20021080141) 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, 10010540055 + 10010540056.

It is an arithmetic number, because the mean of its divisors is an integer number (10010540056).

Almost surely, 2^20021080111 is an apocalyptic number.

20021080111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021080111 is an equidigital number, since it uses as much as digits as its factorization.

20021080111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20021080111 its reverse (11108012002), we get a palindrome (31129092113).

The spelling of 20021080111 in words is "twenty billion, twenty-one million, eighty thousand, one hundred eleven".