1321521333223 has 48 divisors (see below), whose sum is σ = 1694839386240. Its totient is φ = 1020796910784.

The previous prime is 1321521333151. The next prime is 1321521333227. The reversal of 1321521333223 is 3223331251231.

It is not a de Polignac number, because 1321521333223 - 2²¹ = 1321519236071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321521333227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64057236 + ... + 64077862.

It is an arithmetic number, because the mean of its divisors is an integer number (35309153880).

Almost surely, 2^{1321521333223} is an apocalyptic number.

1321521333223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1321521333223 is a deficient number, since it is larger than the sum of its proper divisors (373318053017).

1321521333223 is a wasteful number, since it uses less digits than its factorization.

1321521333223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23036 (or 23029 counting only the distinct ones).

The product of its digits is 19440, while the sum is 31.

Adding to 1321521333223 its reverse (3223331251231), we get a palindrome (4544852584454).

The spelling of 1321521333223 in words is "one trillion, three hundred twenty-one billion, five hundred twenty-one million, three hundred thirty-three thousand, two hundred twenty-three".