12820042379 has 4 divisors (see below), whose sum is σ = 12837113760. Its totient is φ = 12802971000.

The previous prime is 12820042357. The next prime is 12820042409. The reversal of 12820042379 is 97324002821.

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-12820042379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12820042309) 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, 8534564 + ... + 8536065.

It is an arithmetic number, because the mean of its divisors is an integer number (3209278440).

Almost surely, 2^12820042379 is an apocalyptic number.

12820042379 is a deficient number, since it is larger than the sum of its proper divisors (17071381).

12820042379 is an equidigital number, since it uses as much as digits as its factorization.

12820042379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17071380.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 12820042379 in words is "twelve billion, eight hundred twenty million, forty-two thousand, three hundred seventy-nine".