10871221 has 2 divisors, whose sum is σ = 10871222. Its totient is φ = 10871220.

The previous prime is 10871213. The next prime is 10871227. The reversal of 10871221 is 12217801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10400625 + 470596 = 3225^2 + 686^2 .

It is an emirp because it is prime and its reverse (12217801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10871221 - 2³ = 10871213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10871192 and 10871201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10871227) 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, 5435610 + 5435611.

It is an arithmetic number, because the mean of its divisors is an integer number (5435611).

Almost surely, 2^10871221 is an apocalyptic number.

It is an amenable number.

10871221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10871221 is an equidigital number, since it uses as much as digits as its factorization.

10871221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 10871221 is about 3297.1534692823. The cubic root of 10871221 is about 221.5267153852.

The spelling of 10871221 in words is "ten million, eight hundred seventy-one thousand, two hundred twenty-one".