3121420205 has 16 divisors (see below), whose sum is σ = 3765910320. Its totient is φ = 2483699712.

The previous prime is 3121420199. The next prime is 3121420219. The reversal of 3121420205 is 5020241213.

It can be written as a sum of positive squares in 8 ways, for example, as 7557001 + 3113863204 = 2749^2 + 55802^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121420205 - 2⁸ = 3121419949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 935981 + ... + 939309.

It is an arithmetic number, because the mean of its divisors is an integer number (235369395).

Almost surely, 2^3121420205 is an apocalyptic number.

It is an amenable number.

3121420205 is a deficient number, since it is larger than the sum of its proper divisors (644490115).

3121420205 is a wasteful number, since it uses less digits than its factorization.

3121420205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4288.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 3121420205 is about 55869.6716027578. The cubic root of 3121420205 is about 1461.4503953176.

Adding to 3121420205 its reverse (5020241213), we get a palindrome (8141661418).

The spelling of 3121420205 in words is "three billion, one hundred twenty-one million, four hundred twenty thousand, two hundred five".