2040421 has 4 divisors (see below), whose sum is σ = 2052000. Its totient is φ = 2028844.

The previous prime is 2040407. The next prime is 2040427. The reversal of 2040421 is 1240402.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1240402 = 2 ⋅620201.

It is a cyclic number.

It is not a de Polignac number, because 2040421 - 2⁷ = 2040293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2040427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5521 + ... + 5878.

It is an arithmetic number, because the mean of its divisors is an integer number (513000).

2^2040421 is an apocalyptic number.

It is an amenable number.

2040421 is a deficient number, since it is larger than the sum of its proper divisors (11579).

2040421 is a wasteful number, since it uses less digits than its factorization.

2040421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11578.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2040421 is about 1428.4330575844. The cubic root of 2040421 is about 126.8352380113.

Adding to 2040421 its reverse (1240402), we get a palindrome (3280823).

The spelling of 2040421 in words is "two million, forty thousand, four hundred twenty-one".