1021271 has 2 divisors, whose sum is σ = 1021272. Its totient is φ = 1021270.

The previous prime is 1021261. The next prime is 1021283. The reversal of 1021271 is 1721201.

It is a weak prime.

It is an emirp because it is prime and its reverse (1721201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021271 - 2¹⁰ = 1020247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021261) 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, 510635 + 510636.

It is an arithmetic number, because the mean of its divisors is an integer number (510636).

2^1021271 is an apocalyptic number.

1021271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021271 is an equidigital number, since it uses as much as digits as its factorization.

1021271 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 1021271 is about 1010.5795367016. The cubic root of 1021271 is about 100.7040646296.

Adding to 1021271 its reverse (1721201), we get a palindrome (2742472).

The spelling of 1021271 in words is "one million, twenty-one thousand, two hundred seventy-one".