3231212221 has 4 divisors (see below), whose sum is σ = 3231795744. Its totient is φ = 3230628700.

The previous prime is 3231212197. The next prime is 3231212227. The reversal of 3231212221 is 1222121323.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1222121323 = 5197 ⋅235159.

It is a cyclic number.

It is not a de Polignac number, because 3231212221 - 2⁵ = 3231212189 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 (3231212227) 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, 283375 + ... + 294556.

It is an arithmetic number, because the mean of its divisors is an integer number (807948936).

Almost surely, 2^3231212221 is an apocalyptic number.

It is an amenable number.

3231212221 is a deficient number, since it is larger than the sum of its proper divisors (583523).

3231212221 is an equidigital number, since it uses as much as digits as its factorization.

3231212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583522.

The product of its digits is 288, while the sum is 19.

The square root of 3231212221 is about 56843.7526998350. The cubic root of 3231212221 is about 1478.3882229796.

Adding to 3231212221 its reverse (1222121323), we get a palindrome (4453333544).

The spelling of 3231212221 in words is "three billion, two hundred thirty-one million, two hundred twelve thousand, two hundred twenty-one".