13223821 has 8 divisors (see below), whose sum is σ = 14442624. Its totient is φ = 12033840.

The previous prime is 13223801. The next prime is 13223831. The reversal of 13223821 is 12832231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13223821 - 2²³ = 4835213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13223792 and 13223801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13223801) 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 7 ways as a sum of consecutive naturals, for example, 6241 + ... + 8086.

It is an arithmetic number, because the mean of its divisors is an integer number (1805328).

Almost surely, 2^13223821 is an apocalyptic number.

It is an amenable number.

13223821 is a deficient number, since it is larger than the sum of its proper divisors (1218803).

13223821 is a wasteful number, since it uses less digits than its factorization.

13223821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14411.

The product of its digits is 576, while the sum is 22.

The square root of 13223821 is about 3636.4572044780. The cubic root of 13223821 is about 236.4752286004.

The spelling of 13223821 in words is "thirteen million, two hundred twenty-three thousand, eight hundred twenty-one".