13221723 has 8 divisors (see below), whose sum is σ = 17928000. Its totient is φ = 8664968.

The previous prime is 13221697. The next prime is 13221737. The reversal of 13221723 is 32712231.

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

It is a cyclic number.

It is not a de Polignac number, because 13221723 - 2¹⁸ = 12959579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221723.

It is not an unprimeable number, because it can be changed into a prime (13221623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37173 + ... + 37526.

It is an arithmetic number, because the mean of its divisors is an integer number (2241000).

Almost surely, 2^13221723 is an apocalyptic number.

13221723 is a deficient number, since it is larger than the sum of its proper divisors (4706277).

13221723 is an equidigital number, since it uses as much as digits as its factorization.

13221723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74761.

The product of its digits is 504, while the sum is 21.

The square root of 13221723 is about 3636.1687254582. The cubic root of 13221723 is about 236.4627220974.

Adding to 13221723 its reverse (32712231), we get a palindrome (45933954).

The spelling of 13221723 in words is "thirteen million, two hundred twenty-one thousand, seven hundred twenty-three".