13125421 has 2 divisors, whose sum is σ = 13125422. Its totient is φ = 13125420.

The previous prime is 13125419. The next prime is 13125439. The reversal of 13125421 is 12452131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 4888521 = 2870^2 + 2211^2 .

It is a cyclic number.

It is not a de Polignac number, because 13125421 - 2¹ = 13125419 is a prime.

Together with 13125419, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13125401) 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, 6562710 + 6562711.

It is an arithmetic number, because the mean of its divisors is an integer number (6562711).

Almost surely, 2^13125421 is an apocalyptic number.

It is an amenable number.

13125421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13125421 is an equidigital number, since it uses as much as digits as its factorization.

13125421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 19.

The square root of 13125421 is about 3622.9022896015. The cubic root of 13125421 is about 235.8872210830.

Adding to 13125421 its reverse (12452131), we get a palindrome (25577552).

It can be divided in two parts, 131 and 25421, that added together give a palindrome (25552).

The spelling of 13125421 in words is "thirteen million, one hundred twenty-five thousand, four hundred twenty-one".