711521221 has 2 divisors, whose sum is σ = 711521222. Its totient is φ = 711521220.

The previous prime is 711521201. The next prime is 711521227. The reversal of 711521221 is 122125117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506745121 + 204776100 = 22511^2 + 14310^2 .

It is a cyclic number.

It is not a de Polignac number, because 711521221 - 2⁵ = 711521189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 711521192 and 711521201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (711521227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 355760610 + 355760611.

It is an arithmetic number, because the mean of its divisors is an integer number (355760611).

Almost surely, 2^711521221 is an apocalyptic number.

It is an amenable number.

711521221 is a deficient number, since it is larger than the sum of its proper divisors (1).

711521221 is an equidigital number, since it uses as much as digits as its factorization.

711521221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 22.

The square root of 711521221 is about 26674.3551187278. The cubic root of 711521221 is about 892.7488219713.

Adding to 711521221 its reverse (122125117), we get a palindrome (833646338).

The spelling of 711521221 in words is "seven hundred eleven million, five hundred twenty-one thousand, two hundred twenty-one".