1231221111312 has 40 divisors (see below), whose sum is σ = 3180884580000. Its totient is φ = 410377354240.

The previous prime is 1231221111293. The next prime is 1231221111317. The reversal of 1231221111312 is 2131111221321.

It is a super-2 number, since 2×1231221111312² (a number of 25 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1231221111317) 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, 251937 + ... + 1589312.

It is an arithmetic number, because the mean of its divisors is an integer number (79522114500).

Almost surely, 2^{1231221111312} is an apocalyptic number.

1231221111312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231221111312 is an abundant number, since it is smaller than the sum of its proper divisors (1949663468688).

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

1231221111312 is a wasteful number, since it uses less digits than its factorization.

1231221111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855191 (or 1855185 counting only the distinct ones).

The product of its digits is 144, while the sum is 21.

Adding to 1231221111312 its reverse (2131111221321), we get a palindrome (3362332332633).

The spelling of 1231221111312 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-one million, one hundred eleven thousand, three hundred twelve".