2131111100 has 18 divisors (see below), whose sum is σ = 4624511304. Its totient is φ = 852444400.

The previous prime is 2131111057. The next prime is 2131111127. The reversal of 2131111100 is 11111312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10655456 + ... + 10655655.

Almost surely, 2^2131111100 is an apocalyptic number.

2131111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131111100 is an abundant number, since it is smaller than the sum of its proper divisors (2493400204).

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

2131111100 is a wasteful number, since it uses less digits than its factorization.

2131111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21311125 (or 21311118 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 2131111100 is about 46163.9588856935. The cubic root of 2131111100 is about 1286.8720361182.

Adding to 2131111100 its reverse (11111312), we get a palindrome (2142222412).

The spelling of 2131111100 in words is "two billion, one hundred thirty-one million, one hundred eleven thousand, one hundred".