3121111212 has 12 divisors (see below), whose sum is σ = 7282592856. Its totient is φ = 1040370400.

The previous prime is 3121111211. The next prime is 3121111237. The reversal of 3121111212 is 2121111213.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 3121111191 and 3121111200.

It is not an unprimeable number, because it can be changed into a prime (3121111211) 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, 130046289 + ... + 130046312.

It is an arithmetic number, because the mean of its divisors is an integer number (606882738).

Almost surely, 2^3121111212 is an apocalyptic number.

It is an amenable number.

3121111212 is an abundant number, since it is smaller than the sum of its proper divisors (4161481644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121111212 is a wasteful number, since it uses less digits than its factorization.

3121111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260092608 (or 260092606 counting only the distinct ones).

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

The square root of 3121111212 is about 55866.9062325810. The cubic root of 3121111212 is about 1461.4021701707.

Adding to 3121111212 its reverse (2121111213), we get a palindrome (5242222425).

Subtracting from 3121111212 its reverse (2121111213), we obtain a palindrome (999999999).

The spelling of 3121111212 in words is "three billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twelve".