7210020221 has 2 divisors, whose sum is σ = 7210020222. Its totient is φ = 7210020220.

The previous prime is 7210020203. The next prime is 7210020253. The reversal of 7210020221 is 1220200127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7193414596 + 16605625 = 84814^2 + 4075^2 .

It is an emirp because it is prime and its reverse (1220200127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7210020221 - 2⁶ = 7210020157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7210020221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7210020821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3605010110 + 3605010111.

It is an arithmetic number, because the mean of its divisors is an integer number (3605010111).

Almost surely, 2^7210020221 is an apocalyptic number.

It is an amenable number.

7210020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7210020221 is an equidigital number, since it uses as much as digits as its factorization.

7210020221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 7210020221 is about 84911.8379320575. The cubic root of 7210020221 is about 1931.8741333335.

Adding to 7210020221 its reverse (1220200127), we get a palindrome (8430220348).

The spelling of 7210020221 in words is "seven billion, two hundred ten million, twenty thousand, two hundred twenty-one".