5204342021 has 2 divisors, whose sum is σ = 5204342022. Its totient is φ = 5204342020.

The previous prime is 5204341981. The next prime is 5204342023. The reversal of 5204342021 is 1202434025.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5128564996 + 75777025 = 71614^2 + 8705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5204342021 is a prime.

It is a Sophie Germain prime.

Together with 5204342023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5204342023) 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, 2602171010 + 2602171011.

It is an arithmetic number, because the mean of its divisors is an integer number (2602171011).

Almost surely, 2^5204342021 is an apocalyptic number.

It is an amenable number.

5204342021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5204342021 is an equidigital number, since it uses as much as digits as its factorization.

5204342021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 5204342021 is about 72141.1257258992. The cubic root of 5204342021 is about 1732.9602852961.

Adding to 5204342021 its reverse (1202434025), we get a palindrome (6406776046).

The spelling of 5204342021 in words is "five billion, two hundred four million, three hundred forty-two thousand, twenty-one".