13921273 has 4 divisors (see below), whose sum is σ = 13936500. Its totient is φ = 13906048.

The previous prime is 13921241. The next prime is 13921289. The reversal of 13921273 is 37212931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11812969 + 2108304 = 3437^2 + 1452^2 .

It is a cyclic number.

It is not a de Polignac number, because 13921273 - 2⁵ = 13921241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13921223) 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, 6148 + ... + 8101.

It is an arithmetic number, because the mean of its divisors is an integer number (3484125).

Almost surely, 2^13921273 is an apocalyptic number.

It is an amenable number.

13921273 is a deficient number, since it is larger than the sum of its proper divisors (15227).

13921273 is an equidigital number, since it uses as much as digits as its factorization.

13921273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15226.

The product of its digits is 2268, while the sum is 28.

The square root of 13921273 is about 3731.1222172424. The cubic root of 13921273 is about 240.5616072507.

It can be divided in two parts, 139 and 21273, that added together give a palindrome (21412).

The spelling of 13921273 in words is "thirteen million, nine hundred twenty-one thousand, two hundred seventy-three".