1212021111100 has 36 divisors (see below), whose sum is σ = 2630267074008. Its totient is φ = 484775032000.

The previous prime is 1212021111089. The next prime is 1212021111101. The reversal of 1212021111100 is 11111202121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212021111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1066830 + ... + 1887370.

It is an arithmetic number, because the mean of its divisors is an integer number (73062974278).

Almost surely, 2^{1212021111100} is an apocalyptic number.

1212021111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212021111100 is an abundant number, since it is smaller than the sum of its proper divisors (1418245962908).

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

1212021111100 is a wasteful number, since it uses less digits than its factorization.

1212021111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835326 (or 835319 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1212021111100 its reverse (11111202121), we get a palindrome (1223132313221).

The spelling of 1212021111100 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred eleven thousand, one hundred".