13221375 has 16 divisors (see below), whose sum is σ = 22000992. Its totient is φ = 7051200.

The previous prime is 13221353. The next prime is 13221379. The reversal of 13221375 is 57312231.

It is not a de Polignac number, because 13221375 - 2⁹ = 13220863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17254 + ... + 18003.

It is an arithmetic number, because the mean of its divisors is an integer number (1375062).

Almost surely, 2^13221375 is an apocalyptic number.

13221375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13221375 is a deficient number, since it is larger than the sum of its proper divisors (8779617).

13221375 is an equidigital number, since it uses as much as digits as its factorization.

13221375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35275 (or 35265 counting only the distinct ones).

The product of its digits is 1260, while the sum is 24.

The square root of 13221375 is about 3636.1208725784. The cubic root of 13221375 is about 236.4606474876.

It can be divided in two parts, 132 and 21375, that multiplied together give a triangular number (2821500 = T₂₃₇₅).

The spelling of 13221375 in words is "thirteen million, two hundred twenty-one thousand, three hundred seventy-five".