5240821 has 2 divisors, whose sum is σ = 5240822. Its totient is φ = 5240820.

The previous prime is 5240819. The next prime is 5240831. The reversal of 5240821 is 1280425.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4536900 + 703921 = 2130^2 + 839^2 .

It is a cyclic number.

It is not a de Polignac number, because 5240821 - 2¹ = 5240819 is a prime.

Together with 5240819, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 5240792 and 5240801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5240831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2620410 + 2620411.

It is an arithmetic number, because the mean of its divisors is an integer number (2620411).

Almost surely, 2^5240821 is an apocalyptic number.

It is an amenable number.

5240821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5240821 is an equidigital number, since it uses as much as digits as its factorization.

5240821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 5240821 is about 2289.2839491859. The cubic root of 5240821 is about 173.6999828426.

The spelling of 5240821 in words is "five million, two hundred forty thousand, eight hundred twenty-one".