21160771 has 2 divisors, whose sum is σ = 21160772. Its totient is φ = 21160770.

The previous prime is 21160747. The next prime is 21160787. The reversal of 21160771 is 17706112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21160771 is a prime.

It is not a weakly prime, because it can be changed into another prime (21160721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580385 + 10580386.

It is an arithmetic number, because the mean of its divisors is an integer number (10580386).

Almost surely, 2^21160771 is an apocalyptic number.

21160771 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160771 is an equidigital number, since it uses as much as digits as its factorization.

21160771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 21160771 is about 4600.0838035845. The cubic root of 21160771 is about 276.5946841007.

Adding to 21160771 its reverse (17706112), we get a palindrome (38866883).

The spelling of 21160771 in words is "twenty-one million, one hundred sixty thousand, seven hundred seventy-one".