27201721 has 2 divisors, whose sum is σ = 27201722. Its totient is φ = 27201720.

The previous prime is 27201661. The next prime is 27201731. The reversal of 27201721 is 12710272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15912121 + 11289600 = 3989^2 + 3360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27201721 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27201692 and 27201701.

It is not a weakly prime, because it can be changed into another prime (27201731) 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, 13600860 + 13600861.

It is an arithmetic number, because the mean of its divisors is an integer number (13600861).

Almost surely, 2^27201721 is an apocalyptic number.

It is an amenable number.

27201721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27201721 is an equidigital number, since it uses as much as digits as its factorization.

27201721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 27201721 is about 5215.5269148956. The cubic root of 27201721 is about 300.7452618974.

Adding to 27201721 its reverse (12710272), we get a palindrome (39911993).

The spelling of 27201721 in words is "twenty-seven million, two hundred one thousand, seven hundred twenty-one".