20110111221100 has 36 divisors (see below), whose sum is σ = 43760498367600. Its totient is φ = 8021637664960.

The previous prime is 20110111221091. The next prime is 20110111221103. The reversal of 20110111221100 is 112211101102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20110111221103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 280049215 + ... + 280121014.

It is an arithmetic number, because the mean of its divisors is an integer number (1215569399100).

Almost surely, 2^{20110111221100} is an apocalyptic number.

20110111221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20110111221100 is an abundant number, since it is smaller than the sum of its proper divisors (23650387146500).

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

20110111221100 is a wasteful number, since it uses less digits than its factorization.

20110111221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560170602 (or 560170595 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20110111221100 its reverse (112211101102), we get a palindrome (20222322322202).

The spelling of 20110111221100 in words is "twenty trillion, one hundred ten billion, one hundred eleven million, two hundred twenty-one thousand, one hundred".