20111201111100 has 144 divisors (see below), whose sum is σ = 63615965567616. Its totient is φ = 4864866528000.

The previous prime is 20111201111059. The next prime is 20111201111117. The reversal of 20111201111100 is 111110211102.

It is a super-2 number, since 2×20111201111100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 5088574 + ... + 8131173.

It is an arithmetic number, because the mean of its divisors is an integer number (441777538664).

Almost surely, 2^{20111201111100} is an apocalyptic number.

20111201111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111201111100 is an abundant number, since it is smaller than the sum of its proper divisors (43504764456516).

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

20111201111100 is a wasteful number, since it uses less digits than its factorization.

20111201111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13220236 (or 13220229 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 20111201111100 its reverse (111110211102), we get a palindrome (20222311322202).

The spelling of 20111201111100 in words is "twenty trillion, one hundred eleven billion, two hundred one million, one hundred eleven thousand, one hundred".