1221113441344 has 112 divisors (see below), whose sum is σ = 2662336169856. Its totient is φ = 553371033600.

The previous prime is 1221113441341. The next prime is 1221113441389. The reversal of 1221113441344 is 4431443111221.

It is a super-2 number, since 2×1221113441344² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221113441341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3137854 + ... + 3505474.

Almost surely, 2^{1221113441344} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221113441344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1331168084928).

1221113441344 is an abundant number, since it is smaller than the sum of its proper divisors (1441222728512).

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

1221113441344 is a wasteful number, since it uses less digits than its factorization.

1221113441344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367764 (or 367754 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

Adding to 1221113441344 its reverse (4431443111221), we get a palindrome (5652556552565).

The spelling of 1221113441344 in words is "one trillion, two hundred twenty-one billion, one hundred thirteen million, four hundred forty-one thousand, three hundred forty-four".