4312231221 has 16 divisors (see below), whose sum is σ = 5966231040. Its totient is φ = 2768409840.

The previous prime is 4312231213. The next prime is 4312231229. The reversal of 4312231221 is 1221322134.

It is an interprime number because it is at equal distance from previous prime (4312231213) and next prime (4312231229).

It is not a de Polignac number, because 4312231221 - 2³ = 4312231213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4312231229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226251 + ... + 244568.

It is an arithmetic number, because the mean of its divisors is an integer number (372889440).

Almost surely, 2^4312231221 is an apocalyptic number.

It is an amenable number.

4312231221 is a deficient number, since it is larger than the sum of its proper divisors (1653999819).

4312231221 is a wasteful number, since it uses less digits than its factorization.

4312231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470936.

The product of its digits is 576, while the sum is 21.

The square root of 4312231221 is about 65667.5812025995. The cubic root of 4312231221 is about 1627.6737012487.

Adding to 4312231221 its reverse (1221322134), we get a palindrome (5533553355).

The spelling of 4312231221 in words is "four billion, three hundred twelve million, two hundred thirty-one thousand, two hundred twenty-one".