111221221022010 has 144 divisors (see below), whose sum is σ = 317906180766720. Its totient is φ = 26958268814400.

The previous prime is 111221221021991. The next prime is 111221221022011. The reversal of 111221221022010 is 10220122122111.

111221221022010 is a `hidden beast` number, since 1 + 1 + 1 + 221 + 2 + 210 + 220 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (111221221022011) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 65360275 + ... + 67040345.

It is an arithmetic number, because the mean of its divisors is an integer number (2207681810880).

Almost surely, 2^{111221221022010} is an apocalyptic number.

111221221022010 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 111221221022010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158953090383360).

111221221022010 is an abundant number, since it is smaller than the sum of its proper divisors (206684959744710).

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

111221221022010 is a wasteful number, since it uses less digits than its factorization.

111221221022010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686185 (or 1686171 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111221221022010 its reverse (10220122122111), we get a palindrome (121441343144121).

The spelling of 111221221022010 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, ten".