20141221 has 2 divisors, whose sum is σ = 20141222. Its totient is φ = 20141220.

The previous prime is 20141207. The next prime is 20141249. The reversal of 20141221 is 12214102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13176900 + 6964321 = 3630^2 + 2639^2 .

It is a cyclic number.

It is not a de Polignac number, because 20141221 - 2²¹ = 18044069 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20141201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10070610 + 10070611.

It is an arithmetic number, because the mean of its divisors is an integer number (10070611).

Almost surely, 2^20141221 is an apocalyptic number.

It is an amenable number.

20141221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20141221 is an equidigital number, since it uses as much as digits as its factorization.

20141221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 20141221 is about 4487.8971690537. The cubic root of 20141221 is about 272.0791517412.

Adding to 20141221 its reverse (12214102), we get a palindrome (32355323).

The spelling of 20141221 in words is "twenty million, one hundred forty-one thousand, two hundred twenty-one".