111211212101 has 16 divisors (see below), whose sum is σ = 121903208448. Its totient is φ = 100616482800.

The previous prime is 111211212089. The next prime is 111211212103. The reversal of 111211212101 is 101212112111.

It is a cyclic number.

It is not a de Polignac number, because 111211212101 - 2¹⁸ = 111210949957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211212103) 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 15 ways as a sum of consecutive naturals, for example, 12228566 + ... + 12237656.

It is an arithmetic number, because the mean of its divisors is an integer number (7618950528).

Almost surely, 2^111211212101 is an apocalyptic number.

111211212101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111211212101 is a deficient number, since it is larger than the sum of its proper divisors (10691996347).

111211212101 is a wasteful number, since it uses less digits than its factorization.

111211212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14312.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111211212101 its reverse (101212112111), we get a palindrome (212423324212).

The spelling of 111211212101 in words is "one hundred eleven billion, two hundred eleven million, two hundred twelve thousand, one hundred one".