12189898121 has 4 divisors (see below), whose sum is σ = 12190147200. Its totient is φ = 12189649044.

The previous prime is 12189898117. The next prime is 12189898139.

12189898121 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12189898121 - 2² = 12189898117 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12189898121.

It is not an unprimeable number, because it can be changed into a prime (12189898181) 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, 24161 + ... + 157998.

It is an arithmetic number, because the mean of its divisors is an integer number (3047536800).

Almost surely, 2^12189898121 is an apocalyptic number.

It is an amenable number.

12189898121 is a deficient number, since it is larger than the sum of its proper divisors (249079).

12189898121 is an equidigital number, since it uses as much as digits as its factorization.

12189898121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249078.

The product of its digits is 165888, while the sum is 50.

The spelling of 12189898121 in words is "twelve billion, one hundred eighty-nine million, eight hundred ninety-eight thousand, one hundred twenty-one".