111212112102 has 128 divisors (see below), whose sum is σ = 288400573440. Its totient is φ = 27763845120.

The previous prime is 111212112101. The next prime is 111212112107. The reversal of 111212112102 is 201211212111.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212112101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14862202 + ... + 14869682.

It is an arithmetic number, because the mean of its divisors is an integer number (2253129480).

Almost surely, 2^111212112102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111212112102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144200286720).

111212112102 is an abundant number, since it is smaller than the sum of its proper divisors (177188461338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111212112102 is a wasteful number, since it uses less digits than its factorization.

111212112102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8958.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111212112102 its reverse (201211212111), we get a palindrome (312423324213).

The spelling of 111212112102 in words is "one hundred eleven billion, two hundred twelve million, one hundred twelve thousand, one hundred two".