10000020221 has 2 divisors, whose sum is σ = 10000020222. Its totient is φ = 10000020220.

The previous prime is 10000020203. The next prime is 10000020241. The reversal of 10000020221 is 12202000001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9997800121 + 2220100 = 99989^2 + 1490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10000020221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10000020199 and 10000020208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10000020241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000010110 + 5000010111.

It is an arithmetic number, because the mean of its divisors is an integer number (5000010111).

Almost surely, 2^10000020221 is an apocalyptic number.

It is an amenable number.

10000020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000020221 is an equidigital number, since it uses as much as digits as its factorization.

10000020221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 10000020221 its reverse (12202000001), we get a palindrome (22202020222).

The spelling of 10000020221 in words is "ten billion, twenty thousand, two hundred twenty-one".