7420523221 has 2 divisors, whose sum is σ = 7420523222. Its totient is φ = 7420523220.

The previous prime is 7420523191. The next prime is 7420523233. The reversal of 7420523221 is 1223250247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5167596996 + 2252926225 = 71886^2 + 47465^2 .

It is a cyclic number.

It is not a de Polignac number, because 7420523221 - 2⁹ = 7420522709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7420523221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7420523261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3710261610 + 3710261611.

It is an arithmetic number, because the mean of its divisors is an integer number (3710261611).

Almost surely, 2^7420523221 is an apocalyptic number.

It is an amenable number.

7420523221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7420523221 is an equidigital number, since it uses as much as digits as its factorization.

7420523221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 7420523221 is about 86142.4588748197. The cubic root of 7420523221 is about 1950.4950065697.

Adding to 7420523221 its reverse (1223250247), we get a palindrome (8643773468).

The spelling of 7420523221 in words is "seven billion, four hundred twenty million, five hundred twenty-three thousand, two hundred twenty-one".