13840221 has 16 divisors (see below), whose sum is σ = 19195200. Its totient is φ = 8859648.

The previous prime is 13840217. The next prime is 13840237. The reversal of 13840221 is 12204831.

13840221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13840221 - 2² = 13840217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13840201) 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, 22050 + ... + 22668.

It is an arithmetic number, because the mean of its divisors is an integer number (1199700).

Almost surely, 2^13840221 is an apocalyptic number.

It is an amenable number.

13840221 is a deficient number, since it is larger than the sum of its proper divisors (5354979).

13840221 is a wasteful number, since it uses less digits than its factorization.

13840221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13840221 is about 3720.2447500131. The cubic root of 13840221 is about 240.0938348356.

The spelling of 13840221 in words is "thirteen million, eight hundred forty thousand, two hundred twenty-one".