12356820842 has 4 divisors (see below), whose sum is σ = 18535231266. Its totient is φ = 6178410420.

The previous prime is 12356820841. The next prime is 12356820877. The reversal of 12356820842 is 24802865321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24802865321 = 13 ⋅1907912717.

It can be written as a sum of positive squares in only one way, i.e., 10166487241 + 2190333601 = 100829^2 + 46801^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12356820842.

It is not an unprimeable number, because it can be changed into a prime (12356820841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3089205209 + ... + 3089205212.

Almost surely, 2^12356820842 is an apocalyptic number.

12356820842 is a deficient number, since it is larger than the sum of its proper divisors (6178410424).

12356820842 is an equidigital number, since it uses as much as digits as its factorization.

12356820842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6178410423.

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 12356820842 in words is "twelve billion, three hundred fifty-six million, eight hundred twenty thousand, eight hundred forty-two".