2231503221 has 4 divisors (see below), whose sum is σ = 2975337632. Its totient is φ = 1487668812.

The previous prime is 2231503199. The next prime is 2231503229. The reversal of 2231503221 is 1223051322.

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 not a de Polignac number, because 2231503221 - 2⁷ = 2231503093 is a prime.

It is a super-3 number, since 3×2231503221³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231503229) 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, 371917201 + ... + 371917206.

It is an arithmetic number, because the mean of its divisors is an integer number (743834408).

Almost surely, 2^2231503221 is an apocalyptic number.

It is an amenable number.

2231503221 is a deficient number, since it is larger than the sum of its proper divisors (743834411).

2231503221 is an equidigital number, since it uses as much as digits as its factorization.

2231503221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743834410.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2231503221 is about 47238.7893684840. The cubic root of 2231503221 is about 1306.7700512208.

Adding to 2231503221 its reverse (1223051322), we get a palindrome (3454554543).

The spelling of 2231503221 in words is "two billion, two hundred thirty-one million, five hundred three thousand, two hundred twenty-one".