1321000042303 has 4 divisors (see below), whose sum is σ = 1321003660608. Its totient is φ = 1320996424000.

The previous prime is 1321000042291. The next prime is 1321000042379. The reversal of 1321000042303 is 3032400001231.

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 1321000042303 - 2²¹ = 1320997945151 is a prime.

It is a super-2 number, since 2×1321000042303² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321000042903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191151 + ... + 2015152.

It is an arithmetic number, because the mean of its divisors is an integer number (330250915152).

Almost surely, 2^{1321000042303} is an apocalyptic number.

1321000042303 is a deficient number, since it is larger than the sum of its proper divisors (3618305).

1321000042303 is an equidigital number, since it uses as much as digits as its factorization.

1321000042303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3618304.

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

Adding to 1321000042303 its reverse (3032400001231), we get a palindrome (4353400043534).

The spelling of 1321000042303 in words is "one trillion, three hundred twenty-one billion, forty-two thousand, three hundred three".