12508421 has 2 divisors, whose sum is σ = 12508422. Its totient is φ = 12508420.

The previous prime is 12508417. The next prime is 12508453. The reversal of 12508421 is 12480521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8940100 + 3568321 = 2990^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 12508421 - 2² = 12508417 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12508921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254210 + 6254211.

It is an arithmetic number, because the mean of its divisors is an integer number (6254211).

Almost surely, 2^12508421 is an apocalyptic number.

It is an amenable number.

12508421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12508421 is an equidigital number, since it uses as much as digits as its factorization.

12508421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 12508421 is about 3536.7246146682. The cubic root of 12508421 is about 232.1315457413.

Adding to 12508421 its reverse (12480521), we get a palindrome (24988942).

The spelling of 12508421 in words is "twelve million, five hundred eight thousand, four hundred twenty-one".