111212221110 has 64 divisors (see below), whose sum is σ = 268206681600. Its totient is φ = 29512590080.

The previous prime is 111212221079. The next prime is 111212221111. The reversal of 111212221110 is 11122212111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 111212221110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212221111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16849591 + ... + 16856189.

It is an arithmetic number, because the mean of its divisors is an integer number (4190729400).

Almost surely, 2^111212221110 is an apocalyptic number.

111212221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111212221110 is an abundant number, since it is smaller than the sum of its proper divisors (156994460490).

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

111212221110 is a wasteful number, since it uses less digits than its factorization.

111212221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9253.

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

Adding to 111212221110 its reverse (11122212111), we get a palindrome (122334433221).

The spelling of 111212221110 in words is "one hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand, one hundred ten".