13221545 has 8 divisors (see below), whose sum is σ = 15906240. Its totient is φ = 10550320.

The previous prime is 13221503. The next prime is 13221553. The reversal of 13221545 is 54512231.

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

It is not a de Polignac number, because 13221545 - 2⁸ = 13221289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221545.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1061 + ... + 5250.

It is an arithmetic number, because the mean of its divisors is an integer number (1988280).

Almost surely, 2^13221545 is an apocalyptic number.

It is an amenable number.

13221545 is a deficient number, since it is larger than the sum of its proper divisors (2684695).

13221545 is an equidigital number, since it uses as much as digits as its factorization.

13221545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6735.

The product of its digits is 1200, while the sum is 23.

The square root of 13221545 is about 3636.1442490638. The cubic root of 13221545 is about 236.4616609510.

Adding to 13221545 its reverse (54512231), we get a palindrome (67733776).

The spelling of 13221545 in words is "thirteen million, two hundred twenty-one thousand, five hundred forty-five".