2041821 has 16 divisors (see below), whose sum is σ = 3091200. Its totient is φ = 1331424.

The previous prime is 2041817. The next prime is 2041849. The reversal of 2041821 is 1281402.

It is not a de Polignac number, because 2041821 - 2² = 2041817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2041794 and 2041803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2041811) 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, 465 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (193200).

2^2041821 is an apocalyptic number.

It is an amenable number.

2041821 is a deficient number, since it is larger than the sum of its proper divisors (1049379).

2041821 is a wasteful number, since it uses less digits than its factorization.

2041821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665 (or 1659 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2041821 is about 1428.9230210197. The cubic root of 2041821 is about 126.8642399896.

It can be divided in two parts, 204 and 1821, that added together give a square (2025 = 45²).

The spelling of 2041821 in words is "two million, forty-one thousand, eight hundred twenty-one".