1321001200443 has 8 divisors (see below), whose sum is σ = 1771881850368. Its totient is φ = 875394008744.

The previous prime is 1321001200433. The next prime is 1321001200511. The reversal of 1321001200443 is 3440021001231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321001200443 - 2¹⁶ = 1321001134907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321001200433) 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 7 ways as a sum of consecutive naturals, for example, 1318363971 + ... + 1318364972.

It is an arithmetic number, because the mean of its divisors is an integer number (221485231296).

Almost surely, 2^{1321001200443} is an apocalyptic number.

1321001200443 is a deficient number, since it is larger than the sum of its proper divisors (450880649925).

1321001200443 is a wasteful number, since it uses less digits than its factorization.

1321001200443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636729113.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1321001200443 its reverse (3440021001231), we get a palindrome (4761022201674).

The spelling of 1321001200443 in words is "one trillion, three hundred twenty-one billion, one million, two hundred thousand, four hundred forty-three".