13442821 has 4 divisors (see below), whose sum is σ = 15363232. Its totient is φ = 11522412.

The previous prime is 13442791. The next prime is 13442831. The reversal of 13442821 is 12824431.

13442821 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13442821 - 2⁹ = 13442309 is a prime.

It is a Duffinian number.

13442821 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13442831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960195 + ... + 960208.

It is an arithmetic number, because the mean of its divisors is an integer number (3840808).

Almost surely, 2^13442821 is an apocalyptic number.

It is an amenable number.

13442821 is a deficient number, since it is larger than the sum of its proper divisors (1920411).

13442821 is an equidigital number, since it uses as much as digits as its factorization.

13442821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920410.

The product of its digits is 1536, while the sum is 25.

The square root of 13442821 is about 3666.4452811954. The cubic root of 13442821 is about 237.7735116728.

The spelling of 13442821 in words is "thirteen million, four hundred forty-two thousand, eight hundred twenty-one".