1212020111100 has 144 divisors (see below), whose sum is σ = 3602245441536. Its totient is φ = 314409888000.

The previous prime is 1212020111069. The next prime is 1212020111119. The reversal of 1212020111100 is 11110202121.

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, 114002785 + ... + 114013415.

It is an arithmetic number, because the mean of its divisors is an integer number (25015593344).

Almost surely, 2^{1212020111100} is an apocalyptic number.

1212020111100 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 1212020111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1801122720768).

1212020111100 is an abundant number, since it is smaller than the sum of its proper divisors (2390225330436).

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

1212020111100 is a wasteful number, since it uses less digits than its factorization.

1212020111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20956 (or 20949 counting only the distinct ones).

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

Adding to 1212020111100 its reverse (11110202121), we get a palindrome (1223130313221).

The spelling of 1212020111100 in words is "one trillion, two hundred twelve billion, twenty million, one hundred eleven thousand, one hundred".