2101663 has 4 divisors (see below), whose sum is σ = 2104600. Its totient is φ = 2098728.

The previous prime is 2101657. The next prime is 2101667. The reversal of 2101663 is 3661012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101663.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388 + ... + 2086.

It is an arithmetic number, because the mean of its divisors is an integer number (526150).

2^2101663 is an apocalyptic number.

2101663 is a deficient number, since it is larger than the sum of its proper divisors (2937).

2101663 is a wasteful number, since it uses less digits than its factorization.

2101663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2101663 is about 1449.7113505798. The cubic root of 2101663 is about 128.0917108043.

Adding to 2101663 its reverse (3661012), we get a palindrome (5762675).

The spelling of 2101663 in words is "two million, one hundred one thousand, six hundred sixty-three".