3123311221 has 4 divisors (see below), whose sum is σ = 3135754944. Its totient is φ = 3110867500.

The previous prime is 3123311159. The next prime is 3123311237. The reversal of 3123311221 is 1221133213.

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: 1221133213 = 109 ⋅11203057.

It is a cyclic number.

It is not a de Polignac number, because 3123311221 - 2⁹ = 3123310709 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 (3123311251) 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, 6221485 + ... + 6221986.

It is an arithmetic number, because the mean of its divisors is an integer number (783938736).

Almost surely, 2^3123311221 is an apocalyptic number.

It is an amenable number.

3123311221 is a deficient number, since it is larger than the sum of its proper divisors (12443723).

3123311221 is a wasteful number, since it uses less digits than its factorization.

3123311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12443722.

The product of its digits is 216, while the sum is 19.

The square root of 3123311221 is about 55886.5924976644. The cubic root of 3123311221 is about 1461.7454605978.

Adding to 3123311221 its reverse (1221133213), we get a palindrome (4344444434).

The spelling of 3123311221 in words is "three billion, one hundred twenty-three million, three hundred eleven thousand, two hundred twenty-one".