3231231221221 has 4 divisors (see below), whose sum is σ = 3342652987500. Its totient is φ = 3119809454944.

The previous prime is 3231231221219. The next prime is 3231231221227. The reversal of 3231231221221 is 1221221321323.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2704837440321 + 526393780900 = 1644639^2 + 725530^2 .

It is a cyclic number.

It is not a de Polignac number, because 3231231221221 - 2¹ = 3231231221219 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 (3231231221227) 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, 55710883096 + ... + 55710883153.

It is an arithmetic number, because the mean of its divisors is an integer number (835663246875).

Almost surely, 2^{3231231221221} is an apocalyptic number.

It is an amenable number.

3231231221221 is a deficient number, since it is larger than the sum of its proper divisors (111421766279).

3231231221221 is a wasteful number, since it uses less digits than its factorization.

3231231221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111421766278.

The product of its digits is 1728, while the sum is 25.

Adding to 3231231221221 its reverse (1221221321323), we get a palindrome (4452452542544).

The spelling of 3231231221221 in words is "three trillion, two hundred thirty-one billion, two hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty-one".