3121021212 has 24 divisors (see below), whose sum is σ = 7328771856. Its totient is φ = 1033713408.

The previous prime is 3121021207. The next prime is 3121021213. The reversal of 3121021212 is 2121201213.

It is a junction number, because it is equal to n+sod(n) for n = 3121021191 and 3121021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121021213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 826413 + ... + 830180.

It is an arithmetic number, because the mean of its divisors is an integer number (305365494).

Almost surely, 2^3121021212 is an apocalyptic number.

It is an amenable number.

3121021212 is an abundant number, since it is smaller than the sum of its proper divisors (4207750644).

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

3121021212 is a wasteful number, since it uses less digits than its factorization.

3121021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656757 (or 1656755 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 3121021212 is about 55866.1007409681. The cubic root of 3121021212 is about 1461.3881230947.

Adding to 3121021212 its reverse (2121201213), we get a palindrome (5242222425).

The spelling of 3121021212 in words is "three billion, one hundred twenty-one million, twenty-one thousand, two hundred twelve".