20212111112021 has 2 divisors, whose sum is σ = 20212111112022. Its totient is φ = 20212111112020.

The previous prime is 20212111111999. The next prime is 20212111112051. The reversal of 20212111112021 is 12021111121202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17111997322225 + 3100113789796 = 4136665^2 + 1760714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212111112021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212111112051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106055556010 + 10106055556011.

It is an arithmetic number, because the mean of its divisors is an integer number (10106055556011).

Almost surely, 2^{20212111112021} is an apocalyptic number.

It is an amenable number.

20212111112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212111112021 is an equidigital number, since it uses as much as digits as its factorization.

20212111112021 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 17.

Adding to 20212111112021 its reverse (12021111121202), we get a palindrome (32233222233223).

The spelling of 20212111112021 in words is "twenty trillion, two hundred twelve billion, one hundred eleven million, one hundred twelve thousand, twenty-one".