13427821 has 4 divisors (see below), whose sum is σ = 14648544. Its totient is φ = 12207100.

The previous prime is 13427809. The next prime is 13427833. The reversal of 13427821 is 12872431.

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 an interprime number because it is at equal distance from previous prime (13427809) and next prime (13427833).

It is a cyclic number.

It is not a de Polignac number, because 13427821 - 2⁵ = 13427789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13427821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13427861) 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 in 3 ways as a sum of consecutive naturals, for example, 610345 + ... + 610366.

It is an arithmetic number, because the mean of its divisors is an integer number (3662136).

Almost surely, 2^13427821 is an apocalyptic number.

13427821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13427821 is a deficient number, since it is larger than the sum of its proper divisors (1220723).

13427821 is a wasteful number, since it uses less digits than its factorization.

13427821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220722.

The product of its digits is 2688, while the sum is 28.

The square root of 13427821 is about 3664.3991321907. The cubic root of 13427821 is about 237.6850399133.

The spelling of 13427821 in words is "thirteen million, four hundred twenty-seven thousand, eight hundred twenty-one".