111221022210 has 64 divisors (see below), whose sum is σ = 276155827200. Its totient is φ = 28638167040.

The previous prime is 111221022203. The next prime is 111221022257. The reversal of 111221022210 is 12220122111.

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 111221022210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284394 + ... + 550746.

It is an arithmetic number, because the mean of its divisors is an integer number (4314934800).

Almost surely, 2^111221022210 is an apocalyptic number.

111221022210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 111221022210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138077913600).

111221022210 is an abundant number, since it is smaller than the sum of its proper divisors (164934804990).

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

111221022210 is a wasteful number, since it uses less digits than its factorization.

111221022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266843.

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

Adding to 111221022210 its reverse (12220122111), we get a palindrome (123441144321).

Subtracting from 111221022210 its reverse (12220122111), we obtain a palindrome (99000900099).

The spelling of 111221022210 in words is "one hundred eleven billion, two hundred twenty-one million, twenty-two thousand, two hundred ten".