13221563 has 8 divisors (see below), whose sum is σ = 14036832. Its totient is φ = 12410496.

The previous prime is 13221553. The next prime is 13221577. The reversal of 13221563 is 36512231.

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 13221563 - 2¹² = 13217467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13221503) 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, 7481 + ... + 9077.

It is an arithmetic number, because the mean of its divisors is an integer number (1754604).

Almost surely, 2^13221563 is an apocalyptic number.

13221563 is a deficient number, since it is larger than the sum of its proper divisors (815269).

13221563 is a wasteful number, since it uses less digits than its factorization.

13221563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101.

The product of its digits is 1080, while the sum is 23.

The square root of 13221563 is about 3636.1467242123. The cubic root of 13221563 is about 236.4617682583.

Adding to 13221563 its reverse (36512231), we get a palindrome (49733794).

The spelling of 13221563 in words is "thirteen million, two hundred twenty-one thousand, five hundred sixty-three".