3120020221 has 4 divisors (see below), whose sum is σ = 3127879612. Its totient is φ = 3112160832.

The previous prime is 3120020207. The next prime is 3120020249. The reversal of 3120020221 is 1220200213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1220200213 = 14177 ⋅86069.

It can be written as a sum of positive squares in 2 ways, for example, as 1023296121 + 2096724100 = 31989^2 + 45790^2 .

It is a cyclic number.

It is not a de Polignac number, because 3120020221 - 2¹¹ = 3120018173 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 (3120020291) 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, 3929100 + ... + 3929893.

It is an arithmetic number, because the mean of its divisors is an integer number (781969903).

Almost surely, 2^3120020221 is an apocalyptic number.

It is an amenable number.

3120020221 is a deficient number, since it is larger than the sum of its proper divisors (7859391).

3120020221 is an equidigital number, since it uses as much as digits as its factorization.

3120020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7859390.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 3120020221 is about 55857.1411817683. The cubic root of 3120020221 is about 1461.2318715906.

Adding to 3120020221 its reverse (1220200213), we get a palindrome (4340220434).

The spelling of 3120020221 in words is "three billion, one hundred twenty million, twenty thousand, two hundred twenty-one".