1212220111100 has 36 divisors (see below), whose sum is σ = 2632668779664. Its totient is φ = 484491521280.

The previous prime is 1212220111049. The next prime is 1212220111153. The reversal of 1212220111100 is 11110222121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4833629 + ... + 5078228.

It is an arithmetic number, because the mean of its divisors is an integer number (73129688324).

Almost surely, 2^{1212220111100} is an apocalyptic number.

1212220111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212220111100 is an abundant number, since it is smaller than the sum of its proper divisors (1420448668564).

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

1212220111100 is a wasteful number, since it uses less digits than its factorization.

1212220111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9913094 (or 9913087 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212220111100 its reverse (11110222121), we get a palindrome (1223330333221).

The spelling of 1212220111100 in words is "one trillion, two hundred twelve billion, two hundred twenty million, one hundred eleven thousand, one hundred".