13221722 has 4 divisors (see below), whose sum is σ = 19832586. Its totient is φ = 6610860.

The previous prime is 13221697. The next prime is 13221737. The reversal of 13221722 is 22712231.

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

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 398161 = 3581^2 + 631^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13221694 and 13221703.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305429 + ... + 3305432.

Almost surely, 2^13221722 is an apocalyptic number.

13221722 is a deficient number, since it is larger than the sum of its proper divisors (6610864).

13221722 is an equidigital number, since it uses as much as digits as its factorization.

13221722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6610863.

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

The square root of 13221722 is about 3636.1685879508. The cubic root of 13221722 is about 236.4627161360.

Adding to 13221722 its reverse (22712231), we get a palindrome (35933953).

The spelling of 13221722 in words is "thirteen million, two hundred twenty-one thousand, seven hundred twenty-two".