12546421 has 2 divisors, whose sum is σ = 12546422. Its totient is φ = 12546420.

The previous prime is 12546397. The next prime is 12546427. The reversal of 12546421 is 12464521.

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., 12040900 + 505521 = 3470^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 12546421 - 2¹⁵ = 12513653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12546427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6273210 + 6273211.

It is an arithmetic number, because the mean of its divisors is an integer number (6273211).

Almost surely, 2^12546421 is an apocalyptic number.

It is an amenable number.

12546421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12546421 is an equidigital number, since it uses as much as digits as its factorization.

12546421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

The square root of 12546421 is about 3542.0927429981. The cubic root of 12546421 is about 232.3663763723.

The spelling of 12546421 in words is "twelve million, five hundred forty-six thousand, four hundred twenty-one".