20003123213 has 2 divisors, whose sum is σ = 20003123214. Its totient is φ = 20003123212.

The previous prime is 20003123197. The next prime is 20003123243. The reversal of 20003123213 is 31232130002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19306268809 + 696854404 = 138947^2 + 26398^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003123213 - 2⁴ = 20003123197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20003123191 and 20003123200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003123243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001561606 + 10001561607.

It is an arithmetic number, because the mean of its divisors is an integer number (10001561607).

Almost surely, 2^20003123213 is an apocalyptic number.

It is an amenable number.

20003123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003123213 is an equidigital number, since it uses as much as digits as its factorization.

20003123213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20003123213 its reverse (31232130002), we get a palindrome (51235253215).

It can be divided in two parts, 2000 and 3123213, that added together give a palindrome (3125213).

The spelling of 20003123213 in words is "twenty billion, three million, one hundred twenty-three thousand, two hundred thirteen".