1321033401221 has 12 divisors (see below), whose sum is σ = 1358677526880. Its totient is φ = 1284363557400.

The previous prime is 1321033401217. The next prime is 1321033401223. The reversal of 1321033401221 is 1221043301231.

It is not a de Polignac number, because 1321033401221 - 2² = 1321033401217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321033401223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1646651 + ... + 2313768.

It is an arithmetic number, because the mean of its divisors is an integer number (113223127240).

Almost surely, 2^{1321033401221} is an apocalyptic number.

It is an amenable number.

1321033401221 is a deficient number, since it is larger than the sum of its proper divisors (37644125659).

1321033401221 is an equidigital number, since it uses as much as digits as its factorization.

1321033401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960664 (or 3960617 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1321033401221 its reverse (1221043301231), we get a palindrome (2542076702452).

The spelling of 1321033401221 in words is "one trillion, three hundred twenty-one billion, thirty-three million, four hundred one thousand, two hundred twenty-one".