2103681 has 4 divisors (see below), whose sum is σ = 2804912. Its totient is φ = 1402452.

The previous prime is 2103679. The next prime is 2103683. The reversal of 2103681 is 1863012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2103679) and next prime (2103683).

It is not a de Polignac number, because 2103681 - 2¹ = 2103679 is a prime.

It is a super-2 number, since 2×2103681² = 8850947499522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2103683) 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, 350611 + ... + 350616.

It is an arithmetic number, because the mean of its divisors is an integer number (701228).

2^2103681 is an apocalyptic number.

It is an amenable number.

2103681 is a deficient number, since it is larger than the sum of its proper divisors (701231).

2103681 is an equidigital number, since it uses as much as digits as its factorization.

2103681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701230.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2103681 is about 1450.4071842072. The cubic root of 2103681 is about 128.1326952348.

Adding to 2103681 its reverse (1863012), we get a palindrome (3966693).

The spelling of 2103681 in words is "two million, one hundred three thousand, six hundred eighty-one".