2121100100 has 36 divisors (see below), whose sum is σ = 5260329984. Its totient is φ = 727234080.

The previous prime is 2121100099. The next prime is 2121100103. The reversal of 2121100100 is 10011212.

It is not an unprimeable number, because it can be changed into a prime (2121100103) 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, 1514372 + ... + 1515771.

Almost surely, 2^2121100100 is an apocalyptic number.

2121100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121100100 is an abundant number, since it is smaller than the sum of its proper divisors (3139229884).

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

2121100100 is a wasteful number, since it uses less digits than its factorization.

2121100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030164 (or 3030157 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2121100100 is about 46055.4025061121. The cubic root of 2121100100 is about 1284.8538242077.

Adding to 2121100100 its reverse (10011212), we get a palindrome (2131111312).

The spelling of 2121100100 in words is "two billion, one hundred twenty-one million, one hundred thousand, one hundred".