13201921 has 4 divisors (see below), whose sum is σ = 13245232. Its totient is φ = 13158612.

The previous prime is 13201919. The next prime is 13201943. The reversal of 13201921 is 12910231.

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 13201921 - 2¹ = 13201919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13201121) 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, 21195 + ... + 21808.

It is an arithmetic number, because the mean of its divisors is an integer number (3311308).

Almost surely, 2^13201921 is an apocalyptic number.

It is an amenable number.

13201921 is a deficient number, since it is larger than the sum of its proper divisors (43311).

13201921 is an equidigital number, since it uses as much as digits as its factorization.

13201921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43310.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 13201921 is about 3633.4447842234. Note that the first 3 decimals coincide. The cubic root of 13201921 is about 236.3446140824.

The spelling of 13201921 in words is "thirteen million, two hundred one thousand, nine hundred twenty-one".