12870121 has 4 divisors (see below), whose sum is σ = 14040144. Its totient is φ = 11700100.

The previous prime is 12870107. The next prime is 12870157. The reversal of 12870121 is 12107821.

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 12870121 - 2⁵ = 12870089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12870092 and 12870101.

It is not an unprimeable number, because it can be changed into a prime (12870101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584995 + ... + 585016.

It is an arithmetic number, because the mean of its divisors is an integer number (3510036).

Almost surely, 2^12870121 is an apocalyptic number.

12870121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12870121 is a deficient number, since it is larger than the sum of its proper divisors (1170023).

12870121 is a wasteful number, since it uses less digits than its factorization.

12870121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170022.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 12870121 is about 3587.4950871046. The cubic root of 12870121 is about 234.3477977555.

Adding to 12870121 its reverse (12107821), we get a palindrome (24977942).

The spelling of 12870121 in words is "twelve million, eight hundred seventy thousand, one hundred twenty-one".