12921223 has 8 divisors (see below), whose sum is σ = 14821920. Its totient is φ = 11034240.

The previous prime is 12921217. The next prime is 12921263. The reversal of 12921223 is 32212921.

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

It is a de Polignac number, because none of the positive numbers 2^k-12921223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12921194 and 12921203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1318 + ... + 5251.

It is an arithmetic number, because the mean of its divisors is an integer number (1852740).

Almost surely, 2^12921223 is an apocalyptic number.

12921223 is a deficient number, since it is larger than the sum of its proper divisors (1900697).

12921223 is an equidigital number, since it uses as much as digits as its factorization.

12921223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6857.

The product of its digits is 432, while the sum is 22.

The square root of 12921223 is about 3594.6102709473. The cubic root of 12921223 is about 234.6575546440.

The spelling of 12921223 in words is "twelve million, nine hundred twenty-one thousand, two hundred twenty-three".