20323123213 has 2 divisors, whose sum is σ = 20323123214. Its totient is φ = 20323123212.

The previous prime is 20323123207. The next prime is 20323123231. The reversal of 20323123213 is 31232132302.

Together with next prime (20323123231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13688532004 + 6634591209 = 116998^2 + 81453^2 .

It is a cyclic number.

It is not a de Polignac number, because 20323123213 - 2²⁹ = 19786252301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20323123243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161561606 + 10161561607.

It is an arithmetic number, because the mean of its divisors is an integer number (10161561607).

Almost surely, 2^20323123213 is an apocalyptic number.

It is an amenable number.

20323123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323123213 is an equidigital number, since it uses as much as digits as its factorization.

20323123213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 20323123213 its reverse (31232132302), we get a palindrome (51555255515).

The spelling of 20323123213 in words is "twenty billion, three hundred twenty-three million, one hundred twenty-three thousand, two hundred thirteen".