300210020021 has 2 divisors, whose sum is σ = 300210020022. Its totient is φ = 300210020020.

The previous prime is 300210020017. The next prime is 300210020023. The reversal of 300210020021 is 120020012003.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197113800625 + 103096219396 = 443975^2 + 321086^2 .

It is a cyclic number.

It is not a de Polignac number, because 300210020021 - 2² = 300210020017 is a prime.

It is a super-2 number, since 2×300210020021² (a number of 24 digits) contains 22 as substring.

Together with 300210020023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 300210019984 and 300210020011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (300210020023) 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, 150105010010 + 150105010011.

It is an arithmetic number, because the mean of its divisors is an integer number (150105010011).

Almost surely, 2^300210020021 is an apocalyptic number.

It is an amenable number.

300210020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

300210020021 is an equidigital number, since it uses as much as digits as its factorization.

300210020021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 300210020021 its reverse (120020012003), we get a palindrome (420230032024).

The spelling of 300210020021 in words is "three hundred billion, two hundred ten million, twenty thousand, twenty-one".