1871243320321 has 4 divisors (see below), whose sum is σ = 1871297952772. Its totient is φ = 1871188687872.

The previous prime is 1871243320307. The next prime is 1871243320337. The reversal of 1871243320321 is 1230233421781.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1696339534096 + 174903786225 = 1302436^2 + 418215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1871243320321 - 2³³ = 1862653385729 is a prime.

It is a super-2 number, since 2×1871243320321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1871243323321) 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, 27264816 + ... + 27333361.

It is an arithmetic number, because the mean of its divisors is an integer number (467824488193).

Almost surely, 2^{1871243320321} is an apocalyptic number.

It is an amenable number.

1871243320321 is a deficient number, since it is larger than the sum of its proper divisors (54632451).

1871243320321 is an equidigital number, since it uses as much as digits as its factorization.

1871243320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54632450.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 1871243320321 in words is "one trillion, eight hundred seventy-one billion, two hundred forty-three million, three hundred twenty thousand, three hundred twenty-one".