2040343021 has 4 divisors (see below), whose sum is σ = 2049100092. Its totient is φ = 2031585952.

The previous prime is 2040343013. The next prime is 2040343031. The reversal of 2040343021 is 1203430402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1458858025 + 581484996 = 38195^2 + 24114^2 .

It is a cyclic number.

It is not a de Polignac number, because 2040343021 - 2³ = 2040343013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2040343021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2040343031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4378186 + ... + 4378651.

It is an arithmetic number, because the mean of its divisors is an integer number (512275023).

Almost surely, 2^2040343021 is an apocalyptic number.

It is an amenable number.

2040343021 is a deficient number, since it is larger than the sum of its proper divisors (8757071).

2040343021 is an equidigital number, since it uses as much as digits as its factorization.

2040343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8757070.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 2040343021 is about 45170.1563092270. The cubic root of 2040343021 is about 1268.3362223181.

Adding to 2040343021 its reverse (1203430402), we get a palindrome (3243773423).

The spelling of 2040343021 in words is "two billion, forty million, three hundred forty-three thousand, twenty-one".