111212102220 has 48 divisors (see below), whose sum is σ = 311515061760. Its totient is φ = 29645020096.

The previous prime is 111212102213. The next prime is 111212102251. The reversal of 111212102220 is 22201212111.

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 111212102220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204612 + ... + 514091.

It is an arithmetic number, because the mean of its divisors is an integer number (6489897120).

Almost surely, 2^111212102220 is an apocalyptic number.

111212102220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212102220 is an abundant number, since it is smaller than the sum of its proper divisors (200302959540).

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

111212102220 is a wasteful number, since it uses less digits than its factorization.

111212102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721294 (or 721292 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 111212102220 its reverse (22201212111), we get a palindrome (133413314331).

The spelling of 111212102220 in words is "one hundred eleven billion, two hundred twelve million, one hundred two thousand, two hundred twenty".