3121220121220 has 12 divisors (see below), whose sum is σ = 6554562254604. Its totient is φ = 1248488048480.

The previous prime is 3121220121193. The next prime is 3121220121287. The reversal of 3121220121220 is 221210221213.

It can be written as a sum of positive squares in 2 ways, for example, as 2080477372996 + 1040742748224 = 1442386^2 + 1020168^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78030503011 + ... + 78030503050.

It is an arithmetic number, because the mean of its divisors is an integer number (546213521217).

Almost surely, 2^{3121220121220} is an apocalyptic number.

It is an amenable number.

3121220121220 is an abundant number, since it is smaller than the sum of its proper divisors (3433342133384).

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

3121220121220 is a wasteful number, since it uses less digits than its factorization.

3121220121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156061006070 (or 156061006068 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 3121220121220 its reverse (221210221213), we get a palindrome (3342430342433).

The spelling of 3121220121220 in words is "three trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty".