1321244100443 has 4 divisors (see below), whose sum is σ = 1321248185160. Its totient is φ = 1321240015728.

The previous prime is 1321244100419. The next prime is 1321244100511. The reversal of 1321244100443 is 3440014421231.

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 1321244100443 - 2¹⁶ = 1321244034907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321244100403) 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, 1511105 + ... + 2219442.

It is an arithmetic number, because the mean of its divisors is an integer number (330312046290).

Almost surely, 2^{1321244100443} is an apocalyptic number.

1321244100443 is a deficient number, since it is larger than the sum of its proper divisors (4084717).

1321244100443 is an equidigital number, since it uses as much as digits as its factorization.

1321244100443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4084716.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 1321244100443 its reverse (3440014421231), we get a palindrome (4761258521674).

The spelling of 1321244100443 in words is "one trillion, three hundred twenty-one billion, two hundred forty-four million, one hundred thousand, four hundred forty-three".