20021020111 has 2 divisors, whose sum is σ = 20021020112. Its totient is φ = 20021020110.

The previous prime is 20021020109. The next prime is 20021020147. The reversal of 20021020111 is 11102012002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021020111 - 2¹ = 20021020109 is a prime.

Together with 20021020109, 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 (20021080111) 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, 10010510055 + 10010510056.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510056).

Almost surely, 2^20021020111 is an apocalyptic number.

20021020111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021020111 is an equidigital number, since it uses as much as digits as its factorization.

20021020111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20021020111 its reverse (11102012002), we get a palindrome (31123032113).

The spelling of 20021020111 in words is "twenty billion, twenty-one million, twenty thousand, one hundred eleven".