12798121 has 4 divisors (see below), whose sum is σ = 14626432. Its totient is φ = 10969812.

The previous prime is 12798113. The next prime is 12798131. The reversal of 12798121 is 12189721.

12798121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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: 12189721 = 179 ⋅68099.

It is not a de Polignac number, because 12798121 - 2³ = 12798113 is a prime.

It is a super-2 number, since 2×12798121² = 327583802261282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12798101) 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, 914145 + ... + 914158.

It is an arithmetic number, because the mean of its divisors is an integer number (3656608).

Almost surely, 2^12798121 is an apocalyptic number.

It is an amenable number.

12798121 is a deficient number, since it is larger than the sum of its proper divisors (1828311).

12798121 is an equidigital number, since it uses as much as digits as its factorization.

12798121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828310.

The product of its digits is 2016, while the sum is 31.

The square root of 12798121 is about 3577.4461561287. The cubic root of 12798121 is about 233.9099721858.

Subtracting from 12798121 its reverse (12189721), we obtain a square (608400 = 780²).

The spelling of 12798121 in words is "twelve million, seven hundred ninety-eight thousand, one hundred twenty-one".