1321257075847 has 4 divisors (see below), whose sum is σ = 1322257271776. Its totient is φ = 1320256879920.

The previous prime is 1321257075829. The next prime is 1321257075857. The reversal of 1321257075847 is 7485707521231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321257075847 is a prime.

It is a super-2 number, since 2×1321257075847² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321257075794 and 1321257075803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321257075857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500095983 + ... + 500098624.

It is an arithmetic number, because the mean of its divisors is an integer number (330564317944).

Almost surely, 2^{1321257075847} is an apocalyptic number.

1321257075847 is a deficient number, since it is larger than the sum of its proper divisors (1000195929).

1321257075847 is a wasteful number, since it uses less digits than its factorization.

1321257075847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000195928.

The product of its (nonzero) digits is 3292800, while the sum is 52.

The spelling of 1321257075847 in words is "one trillion, three hundred twenty-one billion, two hundred fifty-seven million, seventy-five thousand, eight hundred forty-seven".