3120321221 has 4 divisors (see below), whose sum is σ = 3155381100. Its totient is φ = 3085261344.

The previous prime is 3120321209. The next prime is 3120321263. The reversal of 3120321221 is 1221230213.

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 1114624996 + 2005696225 = 33386^2 + 44785^2 .

It is a cyclic number.

It is not a de Polignac number, because 3120321221 - 2³⁰ = 2046579397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3120321221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3120321121) 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, 17529806 + ... + 17529983.

It is an arithmetic number, because the mean of its divisors is an integer number (788845275).

Almost surely, 2^3120321221 is an apocalyptic number.

It is an amenable number.

3120321221 is a deficient number, since it is larger than the sum of its proper divisors (35059879).

3120321221 is an equidigital number, since it uses as much as digits as its factorization.

3120321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35059878.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 3120321221 is about 55859.8354902698. The cubic root of 3120321221 is about 1461.2788602444.

Adding to 3120321221 its reverse (1221230213), we get a palindrome (4341551434).

The spelling of 3120321221 in words is "three billion, one hundred twenty million, three hundred twenty-one thousand, two hundred twenty-one".