213421330021 has 2 divisors, whose sum is σ = 213421330022. Its totient is φ = 213421330020.

The previous prime is 213421329973. The next prime is 213421330033. The reversal of 213421330021 is 120033124312.

213421330021 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., 135976562500 + 77444767521 = 368750^2 + 278289^2 .

It is a cyclic number.

It is not a de Polignac number, because 213421330021 - 2²⁷ = 213287112293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213421329974 and 213421330001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213421330091) 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, 106710665010 + 106710665011.

It is an arithmetic number, because the mean of its divisors is an integer number (106710665011).

Almost surely, 2^213421330021 is an apocalyptic number.

It is an amenable number.

213421330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213421330021 is an equidigital number, since it uses as much as digits as its factorization.

213421330021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 213421330021 its reverse (120033124312), we get a palindrome (333454454333).

The spelling of 213421330021 in words is "two hundred thirteen billion, four hundred twenty-one million, three hundred thirty thousand, twenty-one".