82707131023421 has 4 divisors (see below), whose sum is σ = 83559781858812. Its totient is φ = 81854480188032.

The previous prime is 82707131023397. The next prime is 82707131023471. The reversal of 82707131023421 is 12432013170728.

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 24349586320900 + 58357544702521 = 4934530^2 + 7639211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82707131023421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82707131023471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426325417550 + ... + 426325417743.

It is an arithmetic number, because the mean of its divisors is an integer number (20889945464703).

Almost surely, 2^{82707131023421} is an apocalyptic number.

It is an amenable number.

82707131023421 is a deficient number, since it is larger than the sum of its proper divisors (852650835391).

82707131023421 is an equidigital number, since it uses as much as digits as its factorization.

82707131023421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852650835390.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 82707131023421 in words is "eighty-two trillion, seven hundred seven billion, one hundred thirty-one million, twenty-three thousand, four hundred twenty-one".