1221444241413 has 16 divisors (see below), whose sum is σ = 1777099699200. Its totient is φ = 740080266480.

The previous prime is 1221444241397. The next prime is 1221444241417. The reversal of 1221444241413 is 3141424441221.

It is not a de Polignac number, because 1221444241413 - 2⁴ = 1221444241397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221444241417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4592983 + ... + 4851636.

It is an arithmetic number, because the mean of its divisors is an integer number (111068731200).

Almost surely, 2^{1221444241413} is an apocalyptic number.

It is an amenable number.

1221444241413 is a deficient number, since it is larger than the sum of its proper divisors (555655457787).

1221444241413 is a wasteful number, since it uses less digits than its factorization.

1221444241413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9448552.

The product of its digits is 24576, while the sum is 33.

Adding to 1221444241413 its reverse (3141424441221), we get a palindrome (4362868682634).

The spelling of 1221444241413 in words is "one trillion, two hundred twenty-one billion, four hundred forty-four million, two hundred forty-one thousand, four hundred thirteen".