12120813889 has 8 divisors (see below), whose sum is σ = 12167804808. Its totient is φ = 12073850880.

The previous prime is 12120813883. The next prime is 12120813911. The reversal of 12120813889 is 98831802121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1738222864 + 10382591025 = 41692^2 + 101895^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12120813889 - 2⁹ = 12120813377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12120813883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1382929 + ... + 1391665.

It is an arithmetic number, because the mean of its divisors is an integer number (1520975601).

Almost surely, 2^12120813889 is an apocalyptic number.

It is an amenable number.

12120813889 is a deficient number, since it is larger than the sum of its proper divisors (46990919).

12120813889 is an equidigital number, since it uses as much as digits as its factorization.

12120813889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13955.

The product of its (nonzero) digits is 55296, while the sum is 43.

The spelling of 12120813889 in words is "twelve billion, one hundred twenty million, eight hundred thirteen thousand, eight hundred eighty-nine".