12725821 has 2 divisors, whose sum is σ = 12725822. Its totient is φ = 12725820.

The previous prime is 12725819. The next prime is 12725837. The reversal of 12725821 is 12852721.

12725821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7371225 + 5354596 = 2715^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 12725821 - 2¹ = 12725819 is a prime.

Together with 12725819, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12725821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12765821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6362910 + 6362911.

It is an arithmetic number, because the mean of its divisors is an integer number (6362911).

Almost surely, 2^12725821 is an apocalyptic number.

It is an amenable number.

12725821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12725821 is an equidigital number, since it uses as much as digits as its factorization.

12725821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 28.

The square root of 12725821 is about 3567.3268703611. The cubic root of 12725821 is about 233.4686668428.

The spelling of 12725821 in words is "twelve million, seven hundred twenty-five thousand, eight hundred twenty-one".