1321200203023 has 4 divisors (see below), whose sum is σ = 1331285700888. Its totient is φ = 1311114705160.

The previous prime is 1321200203003. The next prime is 1321200203041. The reversal of 1321200203023 is 3203020021231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321200203023 - 2¹⁷ = 1321200071951 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 (1321200203003) 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 3 ways as a sum of consecutive naturals, for example, 5042748736 + ... + 5042748997.

It is an arithmetic number, because the mean of its divisors is an integer number (332821425222).

Almost surely, 2^{1321200203023} is an apocalyptic number.

1321200203023 is a deficient number, since it is larger than the sum of its proper divisors (10085497865).

1321200203023 is a wasteful number, since it uses less digits than its factorization.

1321200203023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10085497864.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 1321200203023 its reverse (3203020021231), we get a palindrome (4524220224254).

The spelling of 1321200203023 in words is "one trillion, three hundred twenty-one billion, two hundred million, two hundred three thousand, twenty-three".