213230210021 has 2 divisors, whose sum is σ = 213230210022. Its totient is φ = 213230210020.

The previous prime is 213230209979. The next prime is 213230210051. The reversal of 213230210021 is 120012032312.

213230210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113595287521 + 99634922500 = 337039^2 + 315650^2 .

It is a cyclic number.

It is not a de Polignac number, because 213230210021 - 2⁶ = 213230209957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213230210051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106615105010 + 106615105011.

It is an arithmetic number, because the mean of its divisors is an integer number (106615105011).

Almost surely, 2^213230210021 is an apocalyptic number.

It is an amenable number.

213230210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213230210021 is an equidigital number, since it uses as much as digits as its factorization.

213230210021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 213230210021 its reverse (120012032312), we get a palindrome (333242242333).

The spelling of 213230210021 in words is "two hundred thirteen billion, two hundred thirty million, two hundred ten thousand, twenty-one".