3121203213 has 80 divisors (see below), whose sum is σ = 5218836480. Its totient is φ = 1849526784.

The previous prime is 3121203209. The next prime is 3121203229. The reversal of 3121203213 is 3123021213.

It is not a de Polignac number, because 3121203213 - 2² = 3121203209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121203713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1876020 + ... + 1877682.

It is an arithmetic number, because the mean of its divisors is an integer number (65235456).

Almost surely, 2^3121203213 is an apocalyptic number.

It is an amenable number.

3121203213 is a deficient number, since it is larger than the sum of its proper divisors (2097633267).

3121203213 is a wasteful number, since it uses less digits than its factorization.

3121203213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768 (or 1759 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 3121203213 is about 55867.7296209538. The cubic root of 3121203213 is about 1461.4165292810.

Adding to 3121203213 its reverse (3123021213), we get a palindrome (6244224426).

The spelling of 3121203213 in words is "three billion, one hundred twenty-one million, two hundred three thousand, two hundred thirteen".