2101660 has 48 divisors (see below), whose sum is σ = 4953312. Its totient is φ = 742400.

The previous prime is 2101657. The next prime is 2101667. The reversal of 2101660 is 661012.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101667) by changing a digit.

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, 8904 + ... + 9136.

It is an arithmetic number, because the mean of its divisors is an integer number (103194).

2^2101660 is an apocalyptic number.

2101660 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 2101660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2476656).

2101660 is an abundant number, since it is smaller than the sum of its proper divisors (2851652).

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

2101660 is a wasteful number, since it uses less digits than its factorization.

2101660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2101660 is about 1449.7103158907. The cubic root of 2101660 is about 128.0916498565.

Adding to 2101660 its reverse (661012), we get a palindrome (2762672).

The spelling of 2101660 in words is "two million, one hundred one thousand, six hundred sixty".