111221220212010 has 48 divisors (see below), whose sum is σ = 289196537555016. Its totient is φ = 29656800774144.

The previous prime is 111221220211987. The next prime is 111221220212029. The reversal of 111221220212010 is 10212022122111.

111221220212010 is a `hidden beast` number, since 1 + 1 + 1 + 221 + 220 + 21 + 201 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 87505790929209 + 23715429282801 = 9354453^2 + 4869849^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44426619 + ... + 46863278.

Almost surely, 2^{111221220212010} is an apocalyptic number.

111221220212010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111221220212010 is an abundant number, since it is smaller than the sum of its proper divisors (177975317343006).

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

111221220212010 is a wasteful number, since it uses less digits than its factorization.

111221220212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91303447 (or 91303444 counting only the distinct ones).

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

Adding to 111221220212010 its reverse (10212022122111), we get a palindrome (121433242334121).

The spelling of 111221220212010 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, ten".