6248540021 has 2 divisors, whose sum is σ = 6248540022. Its totient is φ = 6248540020.

The previous prime is 6248539987. The next prime is 6248540069. The reversal of 6248540021 is 1200458426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3359477521 + 2889062500 = 57961^2 + 53750^2 .

It is a cyclic number.

It is not a de Polignac number, because 6248540021 - 2¹⁴ = 6248523637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6248540021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6248540521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3124270010 + 3124270011.

It is an arithmetic number, because the mean of its divisors is an integer number (3124270011).

Almost surely, 2^6248540021 is an apocalyptic number.

It is an amenable number.

6248540021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6248540021 is an equidigital number, since it uses as much as digits as its factorization.

6248540021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 6248540021 is about 79047.7072469531. The cubic root of 6248540021 is about 1841.8723085872.

Adding to 6248540021 its reverse (1200458426), we get a palindrome (7448998447).

The spelling of 6248540021 in words is "six billion, two hundred forty-eight million, five hundred forty thousand, twenty-one".