20423120213 has 2 divisors, whose sum is σ = 20423120214. Its totient is φ = 20423120212.

The previous prime is 20423120191. The next prime is 20423120239. The reversal of 20423120213 is 31202132402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16615983409 + 3807136804 = 128903^2 + 61702^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423120213 - 2⁶ = 20423120149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20423128213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211560106 + 10211560107.

It is an arithmetic number, because the mean of its divisors is an integer number (10211560107).

Almost surely, 2^20423120213 is an apocalyptic number.

It is an amenable number.

20423120213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423120213 is an equidigital number, since it uses as much as digits as its factorization.

20423120213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20423120213 its reverse (31202132402), we get a palindrome (51625252615).

The spelling of 20423120213 in words is "twenty billion, four hundred twenty-three million, one hundred twenty thousand, two hundred thirteen".