2121021111100 has 36 divisors (see below), whose sum is σ = 4606410481624. Its totient is φ = 847708966080.

The previous prime is 2121021111047. The next prime is 2121021111151. The reversal of 2121021111100 is 11111201212.

It is a happy number.

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, 8621574 + ... + 8864173.

Almost surely, 2^{2121021111100} is an apocalyptic number.

2121021111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121021111100 is an abundant number, since it is smaller than the sum of its proper divisors (2485389370524).

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

2121021111100 is a wasteful number, since it uses less digits than its factorization.

2121021111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17486974 (or 17486967 counting only the distinct ones).

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

Adding to 2121021111100 its reverse (11111201212), we get a palindrome (2132132312312).

The spelling of 2121021111100 in words is "two trillion, one hundred twenty-one billion, twenty-one million, one hundred eleven thousand, one hundred".