5223721 has 4 divisors (see below), whose sum is σ = 5334912. Its totient is φ = 5112532.

The previous prime is 5223707. The next prime is 5223731. The reversal of 5223721 is 1273225.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5223721 - 2¹¹ = 5221673 is a prime.

It is a super-2 number, since 2×5223721² = 54574522171682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5223692 and 5223701.

It is not an unprimeable number, because it can be changed into a prime (5223731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55525 + ... + 55618.

It is an arithmetic number, because the mean of its divisors is an integer number (1333728).

Almost surely, 2^5223721 is an apocalyptic number.

It is an amenable number.

5223721 is a deficient number, since it is larger than the sum of its proper divisors (111191).

5223721 is a wasteful number, since it uses less digits than its factorization.

5223721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111190.

The product of its digits is 840, while the sum is 22.

The square root of 5223721 is about 2285.5461054199. The cubic root of 5223721 is about 173.5108581433.

Adding to 5223721 its reverse (1273225), we get a palindrome (6496946).

The spelling of 5223721 in words is "five million, two hundred twenty-three thousand, seven hundred twenty-one".