1331321121220 has 24 divisors (see below), whose sum is σ = 2885960625408. Its totient is φ = 515350111200.

The previous prime is 1331321121173. The next prime is 1331321121223. The reversal of 1331321121220 is 221211231331.

It is a junction number, because it is equal to n+sod(n) for n = 1331321121191 and 1331321121200.

It is not an unprimeable number, because it can be changed into a prime (1331321121223) 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, 1073645446 + ... + 1073646685.

It is an arithmetic number, because the mean of its divisors is an integer number (120248359392).

Almost surely, 2^{1331321121220} is an apocalyptic number.

1331321121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331321121220 is an abundant number, since it is smaller than the sum of its proper divisors (1554639504188).

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

1331321121220 is a wasteful number, since it uses less digits than its factorization.

1331321121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147292171 (or 2147292169 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1331321121220 its reverse (221211231331), we get a palindrome (1552532352551).

It can be divided in two parts, 1331321 and 121220, that added together give a palindrome (1452541).

The spelling of 1331321121220 in words is "one trillion, three hundred thirty-one billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty".