202221321221 has 2 divisors, whose sum is σ = 202221321222. Its totient is φ = 202221321220.

The previous prime is 202221321191. The next prime is 202221321251. The reversal of 202221321221 is 122123122202.

It is a balanced prime because it is at equal distance from previous prime (202221321191) and next prime (202221321251).

It can be written as a sum of positive squares in only one way, i.e., 202167136900 + 54184321 = 449630^2 + 7361^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221321221 - 2¹⁸ = 202221059077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202221321193 and 202221321202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202221321251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110660610 + 101110660611.

It is an arithmetic number, because the mean of its divisors is an integer number (101110660611).

Almost surely, 2^202221321221 is an apocalyptic number.

It is an amenable number.

202221321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202221321221 is an equidigital number, since it uses as much as digits as its factorization.

202221321221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 202221321221 its reverse (122123122202), we get a palindrome (324344443423).

The spelling of 202221321221 in words is "two hundred two billion, two hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty-one".