13850821 has 2 divisors, whose sum is σ = 13850822. Its totient is φ = 13850820.

The previous prime is 13850789. The next prime is 13850827. The reversal of 13850821 is 12805831.

13850821 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., 9180900 + 4669921 = 3030^2 + 2161^2 .

It is an emirp because it is prime and its reverse (12805831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13850821 - 2⁵ = 13850789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13850821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13850827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6925410 + 6925411.

It is an arithmetic number, because the mean of its divisors is an integer number (6925411).

Almost surely, 2^13850821 is an apocalyptic number.

It is an amenable number.

13850821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13850821 is an equidigital number, since it uses as much as digits as its factorization.

13850821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 13850821 is about 3721.6691147924. The cubic root of 13850821 is about 240.1551138475.

The spelling of 13850821 in words is "thirteen million, eight hundred fifty thousand, eight hundred twenty-one".