2042340221 has 4 divisors (see below), whose sum is σ = 2043675744. Its totient is φ = 2041004700.

The previous prime is 2042340211. The next prime is 2042340263. The reversal of 2042340221 is 1220432402.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2042340221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2042340193 and 2042340202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2042340211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665465 + ... + 668526.

It is an arithmetic number, because the mean of its divisors is an integer number (510918936).

Almost surely, 2^2042340221 is an apocalyptic number.

It is an amenable number.

2042340221 is a deficient number, since it is larger than the sum of its proper divisors (1335523).

2042340221 is a wasteful number, since it uses less digits than its factorization.

2042340221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335522.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 2042340221 is about 45192.2584188929. The cubic root of 2042340221 is about 1268.7499264530.

Adding to 2042340221 its reverse (1220432402), we get a palindrome (3262772623).

The spelling of 2042340221 in words is "two billion, forty-two million, three hundred forty thousand, two hundred twenty-one".