5222721 has 8 divisors (see below), whose sum is σ = 7958464. Its totient is φ = 2984400.

The previous prime is 5222719. The next prime is 5222729. The reversal of 5222721 is 1272225.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5222721 - 2¹ = 5222719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 248701 = 5222721 / (5 + 2 + 2 + 2 + 7 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5222729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124330 + ... + 124371.

It is an arithmetic number, because the mean of its divisors is an integer number (994808).

Almost surely, 2^5222721 is an apocalyptic number.

It is an amenable number.

5222721 is a deficient number, since it is larger than the sum of its proper divisors (2735743).

5222721 is a wasteful number, since it uses less digits than its factorization.

5222721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248711.

The product of its digits is 560, while the sum is 21.

The square root of 5222721 is about 2285.3273288525. The cubic root of 5222721 is about 173.4997854532.

Adding to 5222721 its reverse (1272225), we get a palindrome (6494946).

The spelling of 5222721 in words is "five million, two hundred twenty-two thousand, seven hundred twenty-one".