2100121104 has 20 divisors (see below), whose sum is σ = 5425312976. Its totient is φ = 700040352.

The previous prime is 2100121103. The next prime is 2100121109. The reversal of 2100121104 is 4011210012.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2100121104.

It is not an unprimeable number, because it can be changed into a prime (2100121103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21876214 + ... + 21876309.

Almost surely, 2^2100121104 is an apocalyptic number.

2100121104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2100121104 is an abundant number, since it is smaller than the sum of its proper divisors (3325191872).

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

2100121104 is a wasteful number, since it uses less digits than its factorization.

2100121104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43752534 (or 43752528 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2100121104 is about 45827.0782834778. The cubic root of 2100121104 is about 1280.6037809047.

Adding to 2100121104 its reverse (4011210012), we get a palindrome (6111331116).

It can be divided in two parts, 2100121 and 104, that added together give a triangular number (2100225 = T₂₀₄₉).

The spelling of 2100121104 in words is "two billion, one hundred million, one hundred twenty-one thousand, one hundred four".