5215221 has 18 divisors (see below), whose sum is σ = 8281910. Its totient is φ = 3160080.

The previous prime is 5215211. The next prime is 5215229. The reversal of 5215221 is 1225125.

5215221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3294225 + 1920996 = 1815^2 + 1386^2 .

It is not a de Polignac number, because 5215221 - 2¹⁰ = 5214197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5215194 and 5215203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5215229) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1306 + ... + 3483.

Almost surely, 2^5215221 is an apocalyptic number.

It is an amenable number.

5215221 is a deficient number, since it is larger than the sum of its proper divisors (3066689).

5215221 is a wasteful number, since it uses less digits than its factorization.

5215221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4817 (or 4803 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 5215221 is about 2283.6858365371. The cubic root of 5215221 is about 173.4166951913.

The spelling of 5215221 in words is "five million, two hundred fifteen thousand, two hundred twenty-one".