2113121100 has 72 divisors (see below), whose sum is σ = 6435768640. Its totient is φ = 533839680.

The previous prime is 2113121083. The next prime is 2113121111. The reversal of 2113121100 is 11213112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179662 + ... + 191061.

Almost surely, 2^2113121100 is an apocalyptic number.

2113121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2113121100 is an abundant number, since it is smaller than the sum of its proper divisors (4322647540).

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

2113121100 is a wasteful number, since it uses less digits than its factorization.

2113121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370759 (or 370752 counting only the distinct ones).

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

The square root of 2113121100 is about 45968.6969578212. The cubic root of 2113121100 is about 1283.2407099434.

Adding to 2113121100 its reverse (11213112), we get a palindrome (2124334212).

The spelling of 2113121100 in words is "two billion, one hundred thirteen million, one hundred twenty-one thousand, one hundred".