1220012111100 has 288 divisors, whose sum is σ = 3844824290496. Its totient is φ = 297437184000.

The previous prime is 1220012111057. The next prime is 1220012111173. The reversal of 1220012111100 is 11112100221.

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 95 ways as a sum of consecutive naturals, for example, 123216150 + ... + 123226050.

It is an arithmetic number, because the mean of its divisors is an integer number (13350084342).

Almost surely, 2^{1220012111100} is an apocalyptic number.

1220012111100 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 1220012111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1922412145248).

1220012111100 is an abundant number, since it is smaller than the sum of its proper divisors (2624812179396).

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

1220012111100 is a wasteful number, since it uses less digits than its factorization.

1220012111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10625 (or 10618 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1220012111100 its reverse (11112100221), we get a palindrome (1231124211321).

It can be divided in two parts, 12200121 and 11100, that added together give a palindrome (12211221).

The spelling of 1220012111100 in words is "one trillion, two hundred twenty billion, twelve million, one hundred eleven thousand, one hundred".