1328195721113 has 4 divisors (see below), whose sum is σ = 1328251506960. Its totient is φ = 1328139935268.

The previous prime is 1328195720987. The next prime is 1328195721131. The reversal of 1328195721113 is 3111275918231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1328195721113 - 2⁸ = 1328195720857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328195721143) 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, 27857195 + ... + 27904832.

It is an arithmetic number, because the mean of its divisors is an integer number (332062876740).

Almost surely, 2^{1328195721113} is an apocalyptic number.

It is an amenable number.

1328195721113 is a deficient number, since it is larger than the sum of its proper divisors (55785847).

1328195721113 is an equidigital number, since it uses as much as digits as its factorization.

1328195721113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55785846.

The product of its digits is 90720, while the sum is 44.

The spelling of 1328195721113 in words is "one trillion, three hundred twenty-eight billion, one hundred ninety-five million, seven hundred twenty-one thousand, one hundred thirteen".