1123231221312 has 112 divisors (see below), whose sum is σ = 3052705990080. Its totient is φ = 364231268352.

The previous prime is 1123231221289. The next prime is 1123231221391. The reversal of 1123231221312 is 2131221323211.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68737239 + ... + 68753577.

Almost surely, 2^{1123231221312} is an apocalyptic number.

1123231221312 is a gapful number since it is divisible by the number (12) 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 1123231221312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1526352995040).

1123231221312 is an abundant number, since it is smaller than the sum of its proper divisors (1929474768768).

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

1123231221312 is a wasteful number, since it uses less digits than its factorization.

1123231221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26068 (or 26058 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

Adding to 1123231221312 its reverse (2131221323211), we get a palindrome (3254452544523).

The spelling of 1123231221312 in words is "one trillion, one hundred twenty-three billion, two hundred thirty-one million, two hundred twenty-one thousand, three hundred twelve".