1221222168444 has 24 divisors (see below), whose sum is σ = 2870018529280. Its totient is φ = 404145465264.

The previous prime is 1221222168443. The next prime is 1221222168497. The reversal of 1221222168444 is 4448612221221.

It is a super-2 number, since 2×1221222168444² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222168443) 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, 366072124 + ... + 366075459.

Almost surely, 2^{1221222168444} is an apocalyptic number.

It is an amenable number.

1221222168444 is an abundant number, since it is smaller than the sum of its proper divisors (1648796360836).

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

1221222168444 is a wasteful number, since it uses less digits than its factorization.

1221222168444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732147729 (or 732147727 counting only the distinct ones).

The product of its digits is 98304, while the sum is 39.

Adding to 1221222168444 its reverse (4448612221221), we get a palindrome (5669834389665).

The spelling of 1221222168444 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred sixty-eight thousand, four hundred forty-four".