12221723 has 4 divisors (see below), whose sum is σ = 12229008. Its totient is φ = 12214440.

The previous prime is 12221689. The next prime is 12221749. The reversal of 12221723 is 32712221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32712221 = 947 ⋅34543.

It is a cyclic number.

It is not a de Polignac number, because 12221723 - 2¹⁰ = 12220699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221695 and 12221704.

It is not an unprimeable number, because it can be changed into a prime (12211723) 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, 290 + ... + 4952.

It is an arithmetic number, because the mean of its divisors is an integer number (3057252).

Almost surely, 2^12221723 is an apocalyptic number.

12221723 is a deficient number, since it is larger than the sum of its proper divisors (7285).

12221723 is an equidigital number, since it uses as much as digits as its factorization.

12221723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7284.

The product of its digits is 336, while the sum is 20.

The square root of 12221723 is about 3495.9580947145. The cubic root of 12221723 is about 230.3443047424.

Adding to 12221723 its reverse (32712221), we get a palindrome (44933944).

The spelling of 12221723 in words is "twelve million, two hundred twenty-one thousand, seven hundred twenty-three".