3121311012220 has 96 divisors (see below), whose sum is σ = 6659247893760. Its totient is φ = 1228795077120.

The previous prime is 3121311012199. The next prime is 3121311012233. The reversal of 3121311012220 is 222101131213.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 451902007 + ... + 451908913.

It is an arithmetic number, because the mean of its divisors is an integer number (69367165560).

Almost surely, 2^{3121311012220} is an apocalyptic number.

It is an amenable number.

3121311012220 is an abundant number, since it is smaller than the sum of its proper divisors (3537936881540).

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

3121311012220 is a wasteful number, since it uses less digits than its factorization.

3121311012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8443 (or 8441 counting only the distinct ones).

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

Adding to 3121311012220 its reverse (222101131213), we get a palindrome (3343412143433).

The spelling of 3121311012220 in words is "three trillion, one hundred twenty-one billion, three hundred eleven million, twelve thousand, two hundred twenty".