20021020211111 has 2 divisors, whose sum is σ = 20021020211112. Its totient is φ = 20021020211110.

The previous prime is 20021020211107. The next prime is 20021020211117. The reversal of 20021020211111 is 11111202012002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021020211111 - 2² = 20021020211107 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021020211117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010510105555 + 10010510105556.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510105556).

Almost surely, 2^{20021020211111} is an apocalyptic number.

20021020211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021020211111 is an equidigital number, since it uses as much as digits as its factorization.

20021020211111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20021020211111 its reverse (11111202012002), we get a palindrome (31132222223113).

The spelling of 20021020211111 in words is "twenty trillion, twenty-one billion, twenty million, two hundred eleven thousand, one hundred eleven".