2043421 has 2 divisors, whose sum is σ = 2043422. Its totient is φ = 2043420.

The previous prime is 2043413. The next prime is 2043449. The reversal of 2043421 is 1243402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 972196 = 1035^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2043421 - 2³ = 2043413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2043395 and 2043404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2043401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1021710 + 1021711.

It is an arithmetic number, because the mean of its divisors is an integer number (1021711).

2^2043421 is an apocalyptic number.

It is an amenable number.

2043421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2043421 is an equidigital number, since it uses as much as digits as its factorization.

2043421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 2043421 is about 1429.4827735933. The cubic root of 2043421 is about 126.8973688791.

Adding to 2043421 its reverse (1243402), we get a palindrome (3286823).

The spelling of 2043421 in words is "two million, forty-three thousand, four hundred twenty-one".