20201221010111 has 2 divisors, whose sum is σ = 20201221010112. Its totient is φ = 20201221010110.

The previous prime is 20201221010081. The next prime is 20201221010143. The reversal of 20201221010111 is 11101012210202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201221010111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201221010171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100610505055 + 10100610505056.

It is an arithmetic number, because the mean of its divisors is an integer number (10100610505056).

Almost surely, 2^{20201221010111} is an apocalyptic number.

20201221010111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201221010111 is an equidigital number, since it uses as much as digits as its factorization.

20201221010111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20201221010111 its reverse (11101012210202), we get a palindrome (31302233220313).

The spelling of 20201221010111 in words is "twenty trillion, two hundred one billion, two hundred twenty-one million, ten thousand, one hundred eleven".