2100100100 has 144 divisors (see below), whose sum is σ = 5755131648. Its totient is φ = 648130560.

The previous prime is 2100100097. The next prime is 2100100109. The reversal of 2100100100 is 10010012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (5).

2100100100 is a modest number, since divided by 100100 gives 2100 as remainder.

It is not an unprimeable number, because it can be changed into a prime (2100100109) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 269864 + ... + 277536.

It is an arithmetic number, because the mean of its divisors is an integer number (39966192).

Almost surely, 2^2100100100 is an apocalyptic number.

2100100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2100100100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2877565824).

2100100100 is an abundant number, since it is smaller than the sum of its proper divisors (3655031548).

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

2100100100 is a wasteful number, since it uses less digits than its factorization.

2100100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7734 (or 7727 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 2100100100 is about 45826.8491170842. The cubic root of 2100100100 is about 1280.5995116443.

Adding to 2100100100 its reverse (10010012), we get a palindrome (2110110112).

The spelling of 2100100100 in words is "two billion, one hundred million, one hundred thousand, one hundred".