13622321 has 8 divisors (see below), whose sum is σ = 14531400. Its totient is φ = 12725248.

The previous prime is 13622317. The next prime is 13622341. The reversal of 13622321 is 12322631.

13622321 = T₂₃ + T₂₄ + ... + T₄₃₃.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3150625 + 10471696 = 1775^2 + 3236^2 .

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

It is not a de Polignac number, because 13622321 - 2² = 13622317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13622293 and 13622302.

It is not an unprimeable number, because it can be changed into a prime (13622341) 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, 596 + ... + 5253.

It is an arithmetic number, because the mean of its divisors is an integer number (1816425).

Almost surely, 2^13622321 is an apocalyptic number.

It is an amenable number.

13622321 is a deficient number, since it is larger than the sum of its proper divisors (909079).

13622321 is a wasteful number, since it uses less digits than its factorization.

13622321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6003.

The product of its digits is 432, while the sum is 20.

The square root of 13622321 is about 3690.8428576682. The cubic root of 13622321 is about 238.8271539612.

Adding to 13622321 its reverse (12322631), we get a palindrome (25944952).

The spelling of 13622321 in words is "thirteen million, six hundred twenty-two thousand, three hundred twenty-one".