1221321144441 has 8 divisors (see below), whose sum is σ = 1628459185600. Its totient is φ = 814198599792.

The previous prime is 1221321144413. The next prime is 1221321144469. The reversal of 1221321144441 is 1444411231221.

It is an interprime number because it is at equal distance from previous prime (1221321144413) and next prime (1221321144469).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221321144441 - 2⁶ = 1221321144377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221321144399 and 1221321144408.

It is not an unprimeable number, because it can be changed into a prime (1221321140441) 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, 3688966 + ... + 4006383.

It is an arithmetic number, because the mean of its divisors is an integer number (203557398200).

Almost surely, 2^{1221321144441} is an apocalyptic number.

It is an amenable number.

1221321144441 is a deficient number, since it is larger than the sum of its proper divisors (407138041159).

1221321144441 is an equidigital number, since it uses as much as digits as its factorization.

1221321144441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7748255.

The product of its digits is 6144, while the sum is 30.

Adding to 1221321144441 its reverse (1444411231221), we get a palindrome (2665732375662).

The spelling of 1221321144441 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, one hundred forty-four thousand, four hundred forty-one".