3121211121 has 8 divisors (see below), whose sum is σ = 4756131264. Its totient is φ = 1783549200.

The previous prime is 3121211117. The next prime is 3121211123. The reversal of 3121211121 is 1211121213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3121211121 - 2² = 3121211117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121211121.

It is not an unprimeable number, because it can be changed into a prime (3121211123) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 74314530 + ... + 74314571.

It is an arithmetic number, because the mean of its divisors is an integer number (594516408).

Almost surely, 2^3121211121 is an apocalyptic number.

It is an amenable number.

3121211121 is a deficient number, since it is larger than the sum of its proper divisors (1634920143).

3121211121 is a wasteful number, since it uses less digits than its factorization.

3121211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148629111.

The product of its digits is 24, while the sum is 15.

The square root of 3121211121 is about 55867.8003952187. The cubic root of 3121211121 is about 1461.4177635135.

Adding to 3121211121 its reverse (1211121213), we get a palindrome (4332332334).

The spelling of 3121211121 in words is "three billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-one".