13786021 has 2 divisors, whose sum is σ = 13786022. Its totient is φ = 13786020.

The previous prime is 13786007. The next prime is 13786033. The reversal of 13786021 is 12068731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 1612900 = 3489^2 + 1270^2 .

It is an emirp because it is prime and its reverse (12068731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13786021 - 2¹⁵ = 13753253 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 (13786321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6893010 + 6893011.

It is an arithmetic number, because the mean of its divisors is an integer number (6893011).

Almost surely, 2^13786021 is an apocalyptic number.

It is an amenable number.

13786021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13786021 is an equidigital number, since it uses as much as digits as its factorization.

13786021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 13786021 is about 3712.9531373288. The cubic root of 13786021 is about 239.7800125383.

The spelling of 13786021 in words is "thirteen million, seven hundred eighty-six thousand, twenty-one".