111221201012100 has 144 divisors (see below), whose sum is σ = 327961082480640. Its totient is φ = 29093317545600.

The previous prime is 111221201012081. The next prime is 111221201012111. The reversal of 111221201012100 is 1210102122111.

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 111221201012100.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1409265 + ... + 14980935.

Almost surely, 2^{111221201012100} is an apocalyptic number.

111221201012100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111221201012100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163980541240320).

111221201012100 is an abundant number, since it is smaller than the sum of its proper divisors (216739881468540).

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

111221201012100 is a wasteful number, since it uses less digits than its factorization.

111221201012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13572210 (or 13572203 counting only the distinct ones).

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

Adding to 111221201012100 its reverse (1210102122111), we get a palindrome (112431303134211).

The spelling of 111221201012100 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred one million, twelve thousand, one hundred".