1443221221221 has 80 divisors (see below), whose sum is σ = 2334065635440. Its totient is φ = 883441935360.

The previous prime is 1443221221213. The next prime is 1443221221237. The reversal of 1443221221221 is 1221221223441.

1443221221221 is a `hidden beast` number, since 1 + 4 + 432 + 2 + 1 + 2 + 2 + 1 + 221 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 40204661121 + 1403016560100 = 200511^2 + 1184490^2 .

It is not a de Polignac number, because 1443221221221 - 2³ = 1443221221213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1443221221271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 175548891 + ... + 175557111.

It is an arithmetic number, because the mean of its divisors is an integer number (29175820443).

Almost surely, 2^{1443221221221} is an apocalyptic number.

It is an amenable number.

1443221221221 is a deficient number, since it is larger than the sum of its proper divisors (890844414219).

1443221221221 is a wasteful number, since it uses less digits than its factorization.

1443221221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9108 (or 9099 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 1443221221221 its reverse (1221221223441), we get a palindrome (2664442444662).

The spelling of 1443221221221 in words is "one trillion, four hundred forty-three billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".