1111221212101 has 96 divisors (see below), whose sum is σ = 1594334133504. Its totient is φ = 751028889600.

The previous prime is 1111221212083. The next prime is 1111221212117. The reversal of 1111221212101 is 1012121221111.

It is not a de Polignac number, because 1111221212101 - 2⁹ = 1111221211589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111221212131) 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 in 95 ways as a sum of consecutive naturals, for example, 122228566 + ... + 122237656.

It is an arithmetic number, because the mean of its divisors is an integer number (16607647224).

Almost surely, 2^{1111221212101} is an apocalyptic number.

1111221212101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111221212101 is a deficient number, since it is larger than the sum of its proper divisors (483112921403).

1111221212101 is a wasteful number, since it uses less digits than its factorization.

1111221212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9803 (or 9792 counting only the distinct ones).

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

Adding to 1111221212101 its reverse (1012121221111), we get a palindrome (2123342433212).

The spelling of 1111221212101 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, one hundred one".