20320111221013 has 2 divisors, whose sum is σ = 20320111221014. Its totient is φ = 20320111221012.

The previous prime is 20320111220951. The next prime is 20320111221023. The reversal of 20320111221013 is 31012211102302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20257542702244 + 62568518769 = 4500838^2 + 250137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320111221013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320111221023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160055610506 + 10160055610507.

It is an arithmetic number, because the mean of its divisors is an integer number (10160055610507).

Almost surely, 2^{20320111221013} is an apocalyptic number.

It is an amenable number.

20320111221013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320111221013 is an equidigital number, since it uses as much as digits as its factorization.

20320111221013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20320111221013 its reverse (31012211102302), we get a palindrome (51332322323315).

The spelling of 20320111221013 in words is "twenty trillion, three hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, thirteen".