5231243221 has 4 divisors (see below), whose sum is σ = 5231827744. Its totient is φ = 5230658700.

The previous prime is 5231243197. The next prime is 5231243231. The reversal of 5231243221 is 1223421325.

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 5231243221 - 2⁵ = 5231243189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5231243231) 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, 278625 + ... + 296806.

It is an arithmetic number, because the mean of its divisors is an integer number (1307956936).

Almost surely, 2^5231243221 is an apocalyptic number.

It is an amenable number.

5231243221 is a deficient number, since it is larger than the sum of its proper divisors (584523).

5231243221 is an equidigital number, since it uses as much as digits as its factorization.

5231243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584522.

The product of its digits is 2880, while the sum is 25.

The square root of 5231243221 is about 72327.3338441284. Note that the first 3 decimals coincide. The cubic root of 5231243221 is about 1735.9410410447.

Adding to 5231243221 its reverse (1223421325), we get a palindrome (6454664546).

The spelling of 5231243221 in words is "five billion, two hundred thirty-one million, two hundred forty-three thousand, two hundred twenty-one".