2424400021 has 2 divisors, whose sum is σ = 2424400022. Its totient is φ = 2424400020.

The previous prime is 2424399977. The next prime is 2424400049. The reversal of 2424400021 is 1200044242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2412184996 + 12215025 = 49114^2 + 3495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2424400021 - 2³¹ = 276916373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2424400051) 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 as a sum of consecutive naturals, namely, 1212200010 + 1212200011.

It is an arithmetic number, because the mean of its divisors is an integer number (1212200011).

Almost surely, 2^2424400021 is an apocalyptic number.

It is an amenable number.

2424400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2424400021 is an equidigital number, since it uses as much as digits as its factorization.

2424400021 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 2424400021 is about 49238.1967683627. The cubic root of 2424400021 is about 1343.3878817829.

Adding to 2424400021 its reverse (1200044242), we get a palindrome (3624444263).

The spelling of 2424400021 in words is "two billion, four hundred twenty-four million, four hundred thousand, twenty-one".