13120721067 has 18 divisors (see below), whose sum is σ = 17942515636. Its totient is φ = 8528511680.

The previous prime is 13120721051. The next prime is 13120721087. The reversal of 13120721067 is 76012702131.

It is not a de Polignac number, because 13120721067 - 2⁴ = 13120721051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13120721087) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8133553 + ... + 8135165.

Almost surely, 2^13120721067 is an apocalyptic number.

13120721067 is a deficient number, since it is larger than the sum of its proper divisors (4821794569).

13120721067 is an frugal number, since it uses more digits than its factorization.

13120721067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The spelling of 13120721067 in words is "thirteen billion, one hundred twenty million, seven hundred twenty-one thousand, sixty-seven".