2100011020120 has 128 divisors (see below), whose sum is σ = 5114004517440. Its totient is φ = 771508684800.

The previous prime is 2100011020111. The next prime is 2100011020123. The reversal of 2100011020120 is 210201100012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2100011020097 and 2100011020106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100011020123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103148982 + ... + 103169338.

Almost surely, 2^{2100011020120} is an apocalyptic number.

2100011020120 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 2100011020120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2557002258720).

2100011020120 is an abundant number, since it is smaller than the sum of its proper divisors (3013993497320).

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

2100011020120 is a wasteful number, since it uses less digits than its factorization.

2100011020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21365 (or 21361 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2100011020120 its reverse (210201100012), we get a palindrome (2310212120132).

The spelling of 2100011020120 in words is "two trillion, one hundred billion, eleven million, twenty thousand, one hundred twenty".