13801221 has 48 divisors (see below), whose sum is σ = 23961600. Its totient is φ = 7491744.

The previous prime is 13801213. The next prime is 13801261. The reversal of 13801221 is 12210831.

It is not a de Polignac number, because 13801221 - 2³ = 13801213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13801194 and 13801203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13801261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 174660 + ... + 174738.

It is an arithmetic number, because the mean of its divisors is an integer number (499200).

Almost surely, 2^13801221 is an apocalyptic number.

It is an amenable number.

13801221 is a deficient number, since it is larger than the sum of its proper divisors (10160379).

13801221 is a wasteful number, since it uses less digits than its factorization.

13801221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 13801221 is about 3714.9994616420. Note that the first 3 decimals coincide. The cubic root of 13801221 is about 239.8681046116.

It can be divided in two parts, 1380 and 1221, that added together give a square (2601 = 51²).

The spelling of 13801221 in words is "thirteen million, eight hundred one thousand, two hundred twenty-one".