2402404021 has 2 divisors, whose sum is σ = 2402404022. Its totient is φ = 2402404020.

The previous prime is 2402404019. The next prime is 2402404049. The reversal of 2402404021 is 1204042042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2103598225 + 298805796 = 45865^2 + 17286^2 .

It is a cyclic number.

It is not a de Polignac number, because 2402404021 - 2¹ = 2402404019 is a prime.

Together with 2402404019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2402404021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2402404001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1201202010 + 1201202011.

It is an arithmetic number, because the mean of its divisors is an integer number (1201202011).

Almost surely, 2^2402404021 is an apocalyptic number.

It is an amenable number.

2402404021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2402404021 is an equidigital number, since it uses as much as digits as its factorization.

2402404021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 2402404021 is about 49014.3246510650. The cubic root of 2402404021 is about 1339.3127873384.

Adding to 2402404021 its reverse (1204042042), we get a palindrome (3606446063).

The spelling of 2402404021 in words is "two billion, four hundred two million, four hundred four thousand, twenty-one".