2100780126 has 48 divisors (see below), whose sum is σ = 4729654800. Its totient is φ = 673096704.

The previous prime is 2100780061. The next prime is 2100780127. The reversal of 2100780126 is 6210870012.

It is a self number, because there is not a number n which added to its sum of digits gives 2100780126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100780127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109630 + ... + 127358.

It is an arithmetic number, because the mean of its divisors is an integer number (98534475).

Almost surely, 2^2100780126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2100780126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2364827400).

2100780126 is an abundant number, since it is smaller than the sum of its proper divisors (2628874674).

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

2100780126 is a wasteful number, since it uses less digits than its factorization.

2100780126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17993 (or 17990 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 2100780126 is about 45834.2680316813. The cubic root of 2100780126 is about 1280.7377188637.

The spelling of 2100780126 in words is "two billion, one hundred million, seven hundred eighty thousand, one hundred twenty-six".