12998121 has 4 divisors (see below), whose sum is σ = 17330832. Its totient is φ = 8665412.

The previous prime is 12998099. The next prime is 12998131. The reversal of 12998121 is 12189921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12189921 = 3 ⋅4063307.

It is a cyclic number.

It is not a de Polignac number, because 12998121 - 2⁶ = 12998057 is a prime.

It is a super-2 number, since 2×12998121² = 337902299061282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12998131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2166351 + ... + 2166356.

It is an arithmetic number, because the mean of its divisors is an integer number (4332708).

Almost surely, 2^12998121 is an apocalyptic number.

It is an amenable number.

12998121 is a deficient number, since it is larger than the sum of its proper divisors (4332711).

12998121 is an equidigital number, since it uses as much as digits as its factorization.

12998121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4332710.

The product of its digits is 2592, while the sum is 33.

The square root of 12998121 is about 3605.2906956305. The cubic root of 12998121 is about 235.1221396163.

The spelling of 12998121 in words is "twelve million, nine hundred ninety-eight thousand, one hundred twenty-one".