20434203321013 has 2 divisors, whose sum is σ = 20434203321014. Its totient is φ = 20434203321012.

The previous prime is 20434203320977. The next prime is 20434203321031. The reversal of 20434203321013 is 31012330243402.

It is a happy number.

Together with next prime (20434203321031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18911035137124 + 1523168183889 = 4348682^2 + 1234167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434203321013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20434203321053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217101660506 + 10217101660507.

It is an arithmetic number, because the mean of its divisors is an integer number (10217101660507).

Almost surely, 2^{20434203321013} is an apocalyptic number.

It is an amenable number.

20434203321013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434203321013 is an equidigital number, since it uses as much as digits as its factorization.

20434203321013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 20434203321013 its reverse (31012330243402), we get a palindrome (51446533564415).

The spelling of 20434203321013 in words is "twenty trillion, four hundred thirty-four billion, two hundred three million, three hundred twenty-one thousand, thirteen".