2103921 has 16 divisors (see below), whose sum is σ = 3225600. Its totient is φ = 1353744.

The previous prime is 2103919. The next prime is 2103953. The reversal of 2103921 is 1293012.

It is a happy number.

It is not a de Polignac number, because 2103921 - 2¹ = 2103919 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2103894 and 2103903.

It is not an unprimeable number, because it can be changed into a prime (2103901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561 + ... + 2126.

It is an arithmetic number, because the mean of its divisors is an integer number (201600).

2^2103921 is an apocalyptic number.

It is an amenable number.

2103921 is a deficient number, since it is larger than the sum of its proper divisors (1121679).

2103921 is a wasteful number, since it uses less digits than its factorization.

2103921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725 (or 2719 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2103921 is about 1450.4899172349. The cubic root of 2103921 is about 128.1375677539.

Adding to 2103921 its reverse (1293012), we get a palindrome (3396933).

The spelling of 2103921 in words is "two million, one hundred three thousand, nine hundred twenty-one".