12750421 has 2 divisors, whose sum is σ = 12750422. Its totient is φ = 12750420.

The previous prime is 12750389. The next prime is 12750427. The reversal of 12750421 is 12405721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 1661521 = 3330^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 12750421 - 2⁵ = 12750389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12750392 and 12750401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12750427) 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 as a sum of consecutive naturals, namely, 6375210 + 6375211.

It is an arithmetic number, because the mean of its divisors is an integer number (6375211).

Almost surely, 2^12750421 is an apocalyptic number.

It is an amenable number.

12750421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12750421 is an equidigital number, since it uses as much as digits as its factorization.

12750421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 12750421 is about 3570.7731655763. The cubic root of 12750421 is about 233.6190076972.

The spelling of 12750421 in words is "twelve million, seven hundred fifty thousand, four hundred twenty-one".