5263646021 has 2 divisors, whose sum is σ = 5263646022. Its totient is φ = 5263646020.

The previous prime is 5263645997. The next prime is 5263646083. The reversal of 5263646021 is 1206463625.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3112077796 + 2151568225 = 55786^2 + 46385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5263646021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5263616021) 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 as a sum of consecutive naturals, namely, 2631823010 + 2631823011.

It is an arithmetic number, because the mean of its divisors is an integer number (2631823011).

Almost surely, 2^5263646021 is an apocalyptic number.

It is an amenable number.

5263646021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5263646021 is an equidigital number, since it uses as much as digits as its factorization.

5263646021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 5263646021 is about 72550.9891111072. The cubic root of 5263646021 is about 1739.5178587737.

The spelling of 5263646021 in words is "five billion, two hundred sixty-three million, six hundred forty-six thousand, twenty-one".