1212101020111 has 2 divisors, whose sum is σ = 1212101020112. Its totient is φ = 1212101020110.

The previous prime is 1212101020093. The next prime is 1212101020159. The reversal of 1212101020111 is 1110201012121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212101020111 - 2²⁷ = 1211966802383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212101020091 and 1212101020100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212101020171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606050510055 + 606050510056.

It is an arithmetic number, because the mean of its divisors is an integer number (606050510056).

Almost surely, 2^{1212101020111} is an apocalyptic number.

1212101020111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212101020111 is an equidigital number, since it uses as much as digits as its factorization.

1212101020111 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 13.

Adding to 1212101020111 its reverse (1110201012121), we get a palindrome (2322302032232).

The spelling of 1212101020111 in words is "one trillion, two hundred twelve billion, one hundred one million, twenty thousand, one hundred eleven".