13221040 has 40 divisors (see below), whose sum is σ = 35131680. Its totient is φ = 4532736.

The previous prime is 13221037. The next prime is 13221059. The reversal of 13221040 is 4012231.

13221040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 13221040.

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, 11245 + ... + 12364.

It is an arithmetic number, because the mean of its divisors is an integer number (878292).

Almost surely, 2^13221040 is an apocalyptic number.

13221040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13221040 is an abundant number, since it is smaller than the sum of its proper divisors (21910640).

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

13221040 is a wasteful number, since it uses less digits than its factorization.

13221040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23629 (or 23623 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 13221040 is about 3636.0748067112. The cubic root of 13221040 is about 236.4586503432.

Adding to 13221040 its reverse (4012231), we get a palindrome (17233271).

The spelling of 13221040 in words is "thirteen million, two hundred twenty-one thousand, forty".