13221534 has 8 divisors (see below), whose sum is σ = 26443080. Its totient is φ = 4407176.

The previous prime is 13221503. The next prime is 13221553. The reversal of 13221534 is 43512231.

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

13221534 is an admirable number.

It is a super-2 number, since 2×13221534² = 349617922626312, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13221534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101789 + ... + 1101800.

It is an arithmetic number, because the mean of its divisors is an integer number (3305385).

Almost surely, 2^13221534 is an apocalyptic number.

13221534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13221534 is a wasteful number, since it uses less digits than its factorization.

13221534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203594.

The product of its digits is 720, while the sum is 21.

The square root of 13221534 is about 3636.1427364723. The cubic root of 13221534 is about 236.4615953742.

Adding to 13221534 its reverse (43512231), we get a palindrome (56733765).

The spelling of 13221534 in words is "thirteen million, two hundred twenty-one thousand, five hundred thirty-four".