2021103 has 18 divisors (see below), whose sum is σ = 3396744. Its totient is φ = 1154664.

The previous prime is 2021099. The next prime is 2021119. The reversal of 2021103 is 3011202.

It is a happy number.

It is not a de Polignac number, because 2021103 - 2² = 2021099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021143) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1851 + ... + 2732.

It is an arithmetic number, because the mean of its divisors is an integer number (188708).

2^2021103 is an apocalyptic number.

2021103 is a deficient number, since it is larger than the sum of its proper divisors (1375641).

2021103 is a wasteful number, since it uses less digits than its factorization.

2021103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4603 (or 4593 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2021103 is about 1421.6550214451. The cubic root of 2021103 is about 126.4336907135.

Adding to 2021103 its reverse (3011202), we get a palindrome (5032305).

Subtracting 2021103 from its reverse (3011202), we obtain a palindrome (990099).

The spelling of 2021103 in words is "two million, twenty-one thousand, one hundred three".