20312321213 has 2 divisors, whose sum is σ = 20312321214. Its totient is φ = 20312321212.

The previous prime is 20312321167. The next prime is 20312321219. The reversal of 20312321213 is 31212321302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17854838884 + 2457482329 = 133622^2 + 49573^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312321213 - 2²⁴ = 20295543997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312321219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156160606 + 10156160607.

It is an arithmetic number, because the mean of its divisors is an integer number (10156160607).

Almost surely, 2^20312321213 is an apocalyptic number.

It is an amenable number.

20312321213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312321213 is an equidigital number, since it uses as much as digits as its factorization.

20312321213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20312321213 its reverse (31212321302), we get a palindrome (51524642515).

The spelling of 20312321213 in words is "twenty billion, three hundred twelve million, three hundred twenty-one thousand, two hundred thirteen".