202102112221 has 2 divisors, whose sum is σ = 202102112222. Its totient is φ = 202102112220.

The previous prime is 202102112207. The next prime is 202102112243. The reversal of 202102112221 is 122211201202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116785544121 + 85316568100 = 341739^2 + 292090^2 .

It is a cyclic number.

It is not a de Polignac number, because 202102112221 - 2⁹ = 202102111709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202102112195 and 202102112204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202102112281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101051056110 + 101051056111.

It is an arithmetic number, because the mean of its divisors is an integer number (101051056111).

Almost surely, 2^202102112221 is an apocalyptic number.

It is an amenable number.

202102112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202102112221 is an equidigital number, since it uses as much as digits as its factorization.

202102112221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202102112221 its reverse (122211201202), we get a palindrome (324313313423).

The spelling of 202102112221 in words is "two hundred two billion, one hundred two million, one hundred twelve thousand, two hundred twenty-one".