3121221212 has 6 divisors (see below), whose sum is σ = 5462137128. Its totient is φ = 1560610604.

The previous prime is 3121221209. The next prime is 3121221239. The reversal of 3121221212 is 2121221213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390152648 + ... + 390152655.

It is an arithmetic number, because the mean of its divisors is an integer number (910356188).

Almost surely, 2^3121221212 is an apocalyptic number.

It is an amenable number.

3121221212 is a deficient number, since it is larger than the sum of its proper divisors (2340915916).

3121221212 is a wasteful number, since it uses less digits than its factorization.

3121221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780305307 (or 780305305 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 3121221212 is about 55867.8907065588. The cubic root of 3121221212 is about 1461.4193384525.

Adding to 3121221212 its reverse (2121221213), we get a palindrome (5242442425).

Subtracting from 3121221212 its reverse (2121221213), we obtain a palindrome (999999999).

The spelling of 3121221212 in words is "three billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".