10121221112111 has 2 divisors, whose sum is σ = 10121221112112. Its totient is φ = 10121221112110.

The previous prime is 10121221112089. The next prime is 10121221112117. The reversal of 10121221112111 is 11121112212101.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10121221112111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10121221112111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10121221112117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060610556055 + 5060610556056.

It is an arithmetic number, because the mean of its divisors is an integer number (5060610556056).

Almost surely, 2^{10121221112111} is an apocalyptic number.

10121221112111 is a deficient number, since it is larger than the sum of its proper divisors (1).

10121221112111 is an equidigital number, since it uses as much as digits as its factorization.

10121221112111 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 17.

Adding to 10121221112111 its reverse (11121112212101), we get a palindrome (21242333324212).

It can be divided in two parts, 101 and 21221112111, that added together give a palindrome (21221112212).

The spelling of 10121221112111 in words is "ten trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred eleven".