7527271721 has 2 divisors, whose sum is σ = 7527271722. Its totient is φ = 7527271720.

The previous prime is 7527271711. The next prime is 7527271723. The reversal of 7527271721 is 1271727257.

7527271721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7501465321 + 25806400 = 86611^2 + 5080^2 .

It is a cyclic number.

It is not a de Polignac number, because 7527271721 - 2⁶ = 7527271657 is a prime.

Together with 7527271723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7527271723) 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, 3763635860 + 3763635861.

It is an arithmetic number, because the mean of its divisors is an integer number (3763635861).

Almost surely, 2^7527271721 is an apocalyptic number.

It is an amenable number.

7527271721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7527271721 is an equidigital number, since it uses as much as digits as its factorization.

7527271721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96040, while the sum is 41.

The square root of 7527271721 is about 86759.8508585625. The cubic root of 7527271721 is about 1959.8035101686.

Adding to 7527271721 its reverse (1271727257), we get a palindrome (8798998978).

Subtracting from 7527271721 its reverse (1271727257), we obtain a square (6255544464 = 79092²).

The spelling of 7527271721 in words is "seven billion, five hundred twenty-seven million, two hundred seventy-one thousand, seven hundred twenty-one".