201223321021 has 2 divisors, whose sum is σ = 201223321022. Its totient is φ = 201223321020.

The previous prime is 201223320979. The next prime is 201223321037. The reversal of 201223321021 is 120123322102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168850315396 + 32373005625 = 410914^2 + 179925^2 .

It is a cyclic number.

It is not a de Polignac number, because 201223321021 - 2²¹ = 201221223869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201223321021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201223321051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100611660510 + 100611660511.

It is an arithmetic number, because the mean of its divisors is an integer number (100611660511).

Almost surely, 2^201223321021 is an apocalyptic number.

It is an amenable number.

201223321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201223321021 is an equidigital number, since it uses as much as digits as its factorization.

201223321021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 201223321021 its reverse (120123322102), we get a palindrome (321346643123).

The spelling of 201223321021 in words is "two hundred one billion, two hundred twenty-three million, three hundred twenty-one thousand, twenty-one".