20312312323213 has 2 divisors, whose sum is σ = 20312312323214. Its totient is φ = 20312312323212.

The previous prime is 20312312323187. The next prime is 20312312323243. The reversal of 20312312323213 is 31232321321302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19909470772009 + 402841551204 = 4462003^2 + 634698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312312323213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312312323243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156156161606 + 10156156161607.

It is an arithmetic number, because the mean of its divisors is an integer number (10156156161607).

Almost surely, 2^{20312312323213} is an apocalyptic number.

It is an amenable number.

20312312323213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312312323213 is an equidigital number, since it uses as much as digits as its factorization.

20312312323213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 20312312323213 its reverse (31232321321302), we get a palindrome (51544633644515).

The spelling of 20312312323213 in words is "twenty trillion, three hundred twelve billion, three hundred twelve million, three hundred twenty-three thousand, two hundred thirteen".