2101212020111 has 2 divisors, whose sum is σ = 2101212020112. Its totient is φ = 2101212020110.

The previous prime is 2101212020077. The next prime is 2101212020113. The reversal of 2101212020111 is 1110202121012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101212020111 - 2¹⁴ = 2101212003727 is a prime.

Together with 2101212020113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101212020113) 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, 1050606010055 + 1050606010056.

It is an arithmetic number, because the mean of its divisors is an integer number (1050606010056).

Almost surely, 2^{2101212020111} is an apocalyptic number.

2101212020111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101212020111 is an equidigital number, since it uses as much as digits as its factorization.

2101212020111 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 2101212020111 its reverse (1110202121012), we get a palindrome (3211414141123).

The spelling of 2101212020111 in words is "two trillion, one hundred one billion, two hundred twelve million, twenty thousand, one hundred eleven".