13432221 has 48 divisors (see below), whose sum is σ = 23000640. Its totient is φ = 7464960.

The previous prime is 13432213. The next prime is 13432229. The reversal of 13432221 is 12223431.

13432221 is a `hidden beast` number, since 13 + 432 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (13432213) and next prime (13432229).

It is not a de Polignac number, because 13432221 - 2³ = 13432213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13432194 and 13432203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13432229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69501 + ... + 69693.

It is an arithmetic number, because the mean of its divisors is an integer number (479180).

Almost surely, 2^13432221 is an apocalyptic number.

13432221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13432221 is a deficient number, since it is larger than the sum of its proper divisors (9568419).

13432221 is a wasteful number, since it uses less digits than its factorization.

13432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 263 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 13432221 is about 3664.9994542974. Note that the first 3 decimals coincide. The cubic root of 13432221 is about 237.7109984553.

Adding to 13432221 its reverse (12223431), we get a palindrome (25655652).

It can be divided in two parts, 13 and 432221, that added together give a palindrome (432234).

The spelling of 13432221 in words is "thirteen million, four hundred thirty-two thousand, two hundred twenty-one".