7021020221 has 2 divisors, whose sum is σ = 7021020222. Its totient is φ = 7021020220.

The previous prime is 7021020203. The next prime is 7021020241. The reversal of 7021020221 is 1220201207.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5057200996 + 1963819225 = 71114^2 + 44315^2 .

It is a cyclic number.

It is not a de Polignac number, because 7021020221 - 2¹⁰ = 7021019197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7021020221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7021020241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3510510110 + 3510510111.

It is an arithmetic number, because the mean of its divisors is an integer number (3510510111).

Almost surely, 2^7021020221 is an apocalyptic number.

It is an amenable number.

7021020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7021020221 is an equidigital number, since it uses as much as digits as its factorization.

7021020221 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 7021020221 is about 83791.5283367000. The cubic root of 7021020221 is about 1914.8440424999.

Adding to 7021020221 its reverse (1220201207), we get a palindrome (8241221428).

The spelling of 7021020221 in words is "seven billion, twenty-one million, twenty thousand, two hundred twenty-one".