13864021 has 2 divisors, whose sum is σ = 13864022. Its totient is φ = 13864020.

The previous prime is 13863979. The next prime is 13864031. The reversal of 13864021 is 12046831.

13864021 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., 13793796 + 70225 = 3714^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 13864021 - 2¹¹ = 13861973 is a prime.

It is a super-2 number, since 2×13864021² = 384422156576882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13864031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6932010 + 6932011.

It is an arithmetic number, because the mean of its divisors is an integer number (6932011).

Almost surely, 2^13864021 is an apocalyptic number.

It is an amenable number.

13864021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13864021 is an equidigital number, since it uses as much as digits as its factorization.

13864021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 13864021 is about 3723.4420903245. The cubic root of 13864021 is about 240.2313798682.

The spelling of 13864021 in words is "thirteen million, eight hundred sixty-four thousand, twenty-one".