13112867821 has 16 divisors (see below), whose sum is σ = 13546048176. Its totient is φ = 12684059136.

The previous prime is 13112867791. The next prime is 13112867849. The reversal of 13112867821 is 12876821131.

It can be written as a sum of positive squares in 8 ways, for example, as 561026596 + 12551841225 = 23686^2 + 112035^2 .

It is a cyclic number.

It is not a de Polignac number, because 13112867821 - 2¹³ = 13112859629 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 (13112867021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5707545 + ... + 5709841.

It is an arithmetic number, because the mean of its divisors is an integer number (846628011).

Almost surely, 2^13112867821 is an apocalyptic number.

It is an amenable number.

13112867821 is a deficient number, since it is larger than the sum of its proper divisors (433180355).

13112867821 is a wasteful number, since it uses less digits than its factorization.

13112867821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3168.

The product of its digits is 32256, while the sum is 40.

The spelling of 13112867821 in words is "thirteen billion, one hundred twelve million, eight hundred sixty-seven thousand, eight hundred twenty-one".