5721221 has 4 divisors (see below), whose sum is σ = 6241344. Its totient is φ = 5201100.

The previous prime is 5721211. The next prime is 5721241. The reversal of 5721221 is 1221275.

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 a de Polignac number, because none of the positive numbers 2^k-5721221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5721193 and 5721202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5721211) 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 3 ways as a sum of consecutive naturals, for example, 260045 + ... + 260066.

It is an arithmetic number, because the mean of its divisors is an integer number (1560336).

Almost surely, 2^5721221 is an apocalyptic number.

It is an amenable number.

5721221 is a deficient number, since it is larger than the sum of its proper divisors (520123).

5721221 is a wasteful number, since it uses less digits than its factorization.

5721221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520122.

The product of its digits is 280, while the sum is 20.

The square root of 5721221 is about 2391.9073978731. The cubic root of 5721221 is about 178.8530050033.

Adding to 5721221 its reverse (1221275), we get a palindrome (6942496).

The spelling of 5721221 in words is "five million, seven hundred twenty-one thousand, two hundred twenty-one".