12750121 has 4 divisors (see below), whose sum is σ = 13421200. Its totient is φ = 12079044.

The previous prime is 12750103. The next prime is 12750149. The reversal of 12750121 is 12105721.

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: 12105721 = 397 ⋅30493.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12750121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 671059 = 12750121 / (1 + 2 + 7 + 5 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12750161) 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, 335511 + ... + 335548.

It is an arithmetic number, because the mean of its divisors is an integer number (3355300).

Almost surely, 2^12750121 is an apocalyptic number.

It is an amenable number.

12750121 is a deficient number, since it is larger than the sum of its proper divisors (671079).

12750121 is an equidigital number, since it uses as much as digits as its factorization.

12750121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671078.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 12750121 is about 3570.7311576202. The cubic root of 12750121 is about 233.6171754374.

Adding to 12750121 its reverse (12105721), we get a palindrome (24855842).

The spelling of 12750121 in words is "twelve million, seven hundred fifty thousand, one hundred twenty-one".