201000220021 has 2 divisors, whose sum is σ = 201000220022. Its totient is φ = 201000220020.

The previous prime is 201000220019. The next prime is 201000220093. The reversal of 201000220021 is 120022000102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130714787025 + 70285432996 = 361545^2 + 265114^2 .

It is a cyclic number.

It is not a de Polignac number, because 201000220021 - 2¹ = 201000220019 is a prime.

Together with 201000220019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201000220121) 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, 100500110010 + 100500110011.

It is an arithmetic number, because the mean of its divisors is an integer number (100500110011).

Almost surely, 2^201000220021 is an apocalyptic number.

It is an amenable number.

201000220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201000220021 is an equidigital number, since it uses as much as digits as its factorization.

201000220021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 201000220021 its reverse (120022000102), we get a palindrome (321022220123).

The spelling of 201000220021 in words is "two hundred one billion, two hundred twenty thousand, twenty-one".