20141021 has 2 divisors, whose sum is σ = 20141022. Its totient is φ = 20141020.

The previous prime is 20141003. The next prime is 20141047. The reversal of 20141021 is 12014102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15100996 + 5040025 = 3886^2 + 2245^2 .

It is a cyclic number.

It is not a de Polignac number, because 20141021 - 2¹⁰ = 20139997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20140993 and 20141011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20141081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10070510 + 10070511.

It is an arithmetic number, because the mean of its divisors is an integer number (10070511).

Almost surely, 2^20141021 is an apocalyptic number.

It is an amenable number.

20141021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20141021 is an equidigital number, since it uses as much as digits as its factorization.

20141021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 20141021 is about 4487.8748868479. The cubic root of 20141021 is about 272.0782511667.

Adding to 20141021 its reverse (12014102), we get a palindrome (32155123).

The spelling of 20141021 in words is "twenty million, one hundred forty-one thousand, twenty-one".