5215523221 has 4 divisors (see below), whose sum is σ = 5216828832. Its totient is φ = 5214217612.

The previous prime is 5215523167. The next prime is 5215523231. The reversal of 5215523221 is 1223255125.

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 5215523221 - 2¹⁵ = 5215490453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5215523221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5215523231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646795 + ... + 654808.

It is an arithmetic number, because the mean of its divisors is an integer number (1304207208).

Almost surely, 2^5215523221 is an apocalyptic number.

It is an amenable number.

5215523221 is a deficient number, since it is larger than the sum of its proper divisors (1305611).

5215523221 is a wasteful number, since it uses less digits than its factorization.

5215523221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305610.

The product of its digits is 6000, while the sum is 28.

The square root of 5215523221 is about 72218.5794723214. The cubic root of 5215523221 is about 1734.2004494740.

Adding to 5215523221 its reverse (1223255125), we get a palindrome (6438778346).

The spelling of 5215523221 in words is "five billion, two hundred fifteen million, five hundred twenty-three thousand, two hundred twenty-one".