1221111343344 has 20 divisors (see below), whose sum is σ = 3154537637096. Its totient is φ = 407037114432.

The previous prime is 1221111343339. The next prime is 1221111343367. The reversal of 1221111343344 is 4433431111221.

It is a super-2 number, since 2×1221111343344² (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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12719909779 + ... + 12719909874.

Almost surely, 2^{1221111343344} is an apocalyptic number.

It is an amenable number.

1221111343344 is an abundant number, since it is smaller than the sum of its proper divisors (1933426293752).

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

1221111343344 is a wasteful number, since it uses less digits than its factorization.

1221111343344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25439819664 (or 25439819658 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

Adding to 1221111343344 its reverse (4433431111221), we get a palindrome (5654542454565).

The spelling of 1221111343344 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, three hundred forty-three thousand, three hundred forty-four".