21010271 has 2 divisors, whose sum is σ = 21010272. Its totient is φ = 21010270.

The previous prime is 21010259. The next prime is 21010307. The reversal of 21010271 is 17201012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010271 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 (21013271) 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 as a sum of consecutive naturals, namely, 10505135 + 10505136.

It is an arithmetic number, because the mean of its divisors is an integer number (10505136).

Almost surely, 2^21010271 is an apocalyptic number.

21010271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010271 is an equidigital number, since it uses as much as digits as its factorization.

21010271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 21010271 is about 4583.6962159375. The cubic root of 21010271 is about 275.9373895296.

Adding to 21010271 its reverse (17201012), we get a palindrome (38211283).

The spelling of 21010271 in words is "twenty-one million, ten thousand, two hundred seventy-one".