2101880 has 64 divisors (see below), whose sum is σ = 5482080. Its totient is φ = 716800.

The previous prime is 2101873. The next prime is 2101903. The reversal of 2101880 is 881012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7340 + ... + 7620.

2^2101880 is an apocalyptic number.

2101880 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 2101880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2741040).

2101880 is an abundant number, since it is smaller than the sum of its proper divisors (3380200).

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

2101880 is a wasteful number, since it uses less digits than its factorization.

2101880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 2101880 is about 1449.7861911330. The cubic root of 2101880 is about 128.0961192093.

Adding to 2101880 its reverse (881012), we get a palindrome (2982892).

The spelling of 2101880 in words is "two million, one hundred one thousand, eight hundred eighty".