12798421 has 2 divisors, whose sum is σ = 12798422. Its totient is φ = 12798420.

The previous prime is 12798413. The next prime is 12798427. The reversal of 12798421 is 12489721.

12798421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8346321 + 4452100 = 2889^2 + 2110^2 .

It is an emirp because it is prime and its reverse (12489721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12798421 - 2³ = 12798413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12798427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6399210 + 6399211.

It is an arithmetic number, because the mean of its divisors is an integer number (6399211).

Almost surely, 2^12798421 is an apocalyptic number.

It is an amenable number.

12798421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12798421 is an equidigital number, since it uses as much as digits as its factorization.

12798421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 12798421 is about 3577.4880852352. The cubic root of 12798421 is about 233.9117998615.

The spelling of 12798421 in words is "twelve million, seven hundred ninety-eight thousand, four hundred twenty-one".