3121312101220 has 12 divisors (see below), whose sum is σ = 6554755412604. Its totient is φ = 1248524840480.

The previous prime is 3121312101211. The next prime is 3121312101293. The reversal of 3121312101220 is 221012131213.

It can be written as a sum of positive squares in 2 ways, for example, as 2272809517056 + 848502584164 = 1507584^2 + 921142^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78032802511 + ... + 78032802550.

It is an arithmetic number, because the mean of its divisors is an integer number (546229617717).

Almost surely, 2^{3121312101220} is an apocalyptic number.

It is an amenable number.

3121312101220 is an abundant number, since it is smaller than the sum of its proper divisors (3433443311384).

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

3121312101220 is a wasteful number, since it uses less digits than its factorization.

3121312101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156065605070 (or 156065605068 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 3121312101220 its reverse (221012131213), we get a palindrome (3342324232433).

The spelling of 3121312101220 in words is "three trillion, one hundred twenty-one billion, three hundred twelve million, one hundred one thousand, two hundred twenty".