3121044221 has 4 divisors (see below), whose sum is σ = 3127814844. Its totient is φ = 3114273600.

The previous prime is 3121044211. The next prime is 3121044247. The reversal of 3121044221 is 1224401213.

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 1040772121 + 2080272100 = 32261^2 + 45610^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121044221 - 2¹⁰ = 3121043197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3121044193 and 3121044202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121044211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3384620 + ... + 3385541.

It is an arithmetic number, because the mean of its divisors is an integer number (781953711).

Almost surely, 2^3121044221 is an apocalyptic number.

It is an amenable number.

3121044221 is a deficient number, since it is larger than the sum of its proper divisors (6770623).

3121044221 is an equidigital number, since it uses as much as digits as its factorization.

3121044221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770622.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 3121044221 is about 55866.3066704789. The cubic root of 3121044221 is about 1461.3917143334.

Adding to 3121044221 its reverse (1224401213), we get a palindrome (4345445434).

The spelling of 3121044221 in words is "three billion, one hundred twenty-one million, forty-four thousand, two hundred twenty-one".