1211102111100 has 144 divisors (see below), whose sum is σ = 4052961093888. Its totient is φ = 273488079360.

The previous prime is 1211102111047. The next prime is 1211102111179. The reversal of 1211102111100 is 11112011121.

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, 3299889 + ... + 3648488.

It is an arithmetic number, because the mean of its divisors is an integer number (28145563152).

Almost surely, 2^{1211102111100} is an apocalyptic number.

1211102111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211102111100 is an abundant number, since it is smaller than the sum of its proper divisors (2841858982788).

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

1211102111100 is a wasteful number, since it uses less digits than its factorization.

1211102111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948484 (or 6948477 counting only the distinct ones).

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

Adding to 1211102111100 its reverse (11112011121), we get a palindrome (1222214122221).

It can be divided in two parts, 12111021 and 11100, that added together give a palindrome (12122121).

The spelling of 1211102111100 in words is "one trillion, two hundred eleven billion, one hundred two million, one hundred eleven thousand, one hundred".