2161111100 has 36 divisors (see below), whose sum is σ = 4733462664. Its totient is φ = 856361280.

The previous prime is 2161111087. The next prime is 2161111103. The reversal of 2161111100 is 11111612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161111103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90287 + ... + 111686.

It is an arithmetic number, because the mean of its divisors is an integer number (131485074).

Almost surely, 2^2161111100 is an apocalyptic number.

2161111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161111100 is an abundant number, since it is smaller than the sum of its proper divisors (2572351564).

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

2161111100 is a wasteful number, since it uses less digits than its factorization.

2161111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202094 (or 202087 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 14.

The square root of 2161111100 is about 46487.7521504321. The cubic root of 2161111100 is about 1292.8824234679.

Adding to 2161111100 its reverse (11111612), we get a palindrome (2172222712).

The spelling of 2161111100 in words is "two billion, one hundred sixty-one million, one hundred eleven thousand, one hundred".