13221800 has 24 divisors (see below), whose sum is σ = 30741150. Its totient is φ = 5288640.

The previous prime is 13221781. The next prime is 13221821. The reversal of 13221800 is 812231.

It can be written as a sum of positive squares in 3 ways, for example, as 10719076 + 2502724 = 3274^2 + 1582^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32855 + ... + 33254.

Almost surely, 2^13221800 is an apocalyptic number.

13221800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13221800 is an abundant number, since it is smaller than the sum of its proper divisors (17519350).

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

13221800 is a wasteful number, since it uses less digits than its factorization.

13221800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66125 (or 66116 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 13221800 is about 3636.1793135103. The cubic root of 13221800 is about 236.4631811297.

The spelling of 13221800 in words is "thirteen million, two hundred twenty-one thousand, eight hundred".