5221006821 has 8 divisors (see below), whose sum is σ = 7734824960. Its totient is φ = 3480671196.

The previous prime is 5221006811. The next prime is 5221006853. The reversal of 5221006821 is 1286001225.

It is a happy number.

It is not a de Polignac number, because 5221006821 - 2⁶ = 5221006757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 193370623 = 5221006821 / (5 + 2 + 2 + 1 + 0 + 0 + 6 + 8 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5221006811) 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 in 7 ways as a sum of consecutive naturals, for example, 96685285 + ... + 96685338.

It is an arithmetic number, because the mean of its divisors is an integer number (966853120).

Almost surely, 2^5221006821 is an apocalyptic number.

It is an amenable number.

5221006821 is a deficient number, since it is larger than the sum of its proper divisors (2513818139).

5221006821 is a wasteful number, since it uses less digits than its factorization.

5221006821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193370632 (or 193370626 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 5221006821 is about 72256.5347978991. The cubic root of 5221006821 is about 1734.8080159193.

The spelling of 5221006821 in words is "five billion, two hundred twenty-one million, six thousand, eight hundred twenty-one".