1231113321120 has 96 divisors (see below), whose sum is σ = 3880645493760. Its totient is φ = 328073518080.

The previous prime is 1231113321079. The next prime is 1231113321121. The reversal of 1231113321120 is 211233111321.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (1231113321121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165715 + ... + 1577874.

It is an arithmetic number, because the mean of its divisors is an integer number (40423390560).

Almost surely, 2^{1231113321120} is an apocalyptic number.

1231113321120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231113321120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1940322746880).

1231113321120 is an abundant number, since it is smaller than the sum of its proper divisors (2649532172640).

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

1231113321120 is a wasteful number, since it uses less digits than its factorization.

1231113321120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745078 (or 1745070 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1231113321120 its reverse (211233111321), we get a palindrome (1442346432441).

The spelling of 1231113321120 in words is "one trillion, two hundred thirty-one billion, one hundred thirteen million, three hundred twenty-one thousand, one hundred twenty".