20140221 has 4 divisors (see below), whose sum is σ = 26853632. Its totient is φ = 13426812.

The previous prime is 20140213. The next prime is 20140243. The reversal of 20140221 is 12204102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20140221 - 2³ = 20140213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20140197 and 20140206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20140201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3356701 + ... + 3356706.

It is an arithmetic number, because the mean of its divisors is an integer number (6713408).

Almost surely, 2^20140221 is an apocalyptic number.

It is an amenable number.

20140221 is a deficient number, since it is larger than the sum of its proper divisors (6713411).

20140221 is an equidigital number, since it uses as much as digits as its factorization.

20140221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6713410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20140221 is about 4487.7857569184. The cubic root of 20140221 is about 272.0746488091.

Adding to 20140221 its reverse (12204102), we get a palindrome (32344323).

The spelling of 20140221 in words is "twenty million, one hundred forty thousand, two hundred twenty-one".