111212120011 has 16 divisors (see below), whose sum is σ = 115223692320. Its totient is φ = 107286716160.

The previous prime is 111212120003. The next prime is 111212120057. The reversal of 111212120011 is 110021212111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111212120011 - 2³ = 111212120003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212119973 and 111212120000.

It is not an unprimeable number, because it can be changed into a prime (111212120111) 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, 683311 + ... + 830263.

It is an arithmetic number, because the mean of its divisors is an integer number (7201480770).

Almost surely, 2^111212120011 is an apocalyptic number.

111212120011 is a deficient number, since it is larger than the sum of its proper divisors (4011572309).

111212120011 is a wasteful number, since it uses less digits than its factorization.

111212120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147246.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111212120011 its reverse (110021212111), we get a palindrome (221233332122).

The spelling of 111212120011 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty thousand, eleven".