13203921 has 8 divisors (see below), whose sum is σ = 17659744. Its totient is φ = 8775360.

The previous prime is 13203919. The next prime is 13203929. The reversal of 13203921 is 12930231.

It is a happy number.

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

It is not a de Polignac number, because 13203921 - 2¹ = 13203919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13203929) 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, 5656 + ... + 7641.

It is an arithmetic number, because the mean of its divisors is an integer number (2207468).

Almost surely, 2^13203921 is an apocalyptic number.

It is an amenable number.

13203921 is a deficient number, since it is larger than the sum of its proper divisors (4455823).

13203921 is a wasteful number, since it uses less digits than its factorization.

13203921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13631.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 13203921 is about 3633.7199947162. The cubic root of 13203921 is about 236.3565483395.

The spelling of 13203921 in words is "thirteen million, two hundred three thousand, nine hundred twenty-one".