20011231013321 has 2 divisors, whose sum is σ = 20011231013322. Its totient is φ = 20011231013320.

The previous prime is 20011231013261. The next prime is 20011231013329. The reversal of 20011231013321 is 12331013211002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13518600865225 + 6492630148096 = 3676765^2 + 2548064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011231013321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011231013293 and 20011231013302.

It is not a weakly prime, because it can be changed into another prime (20011231013329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005615506660 + 10005615506661.

It is an arithmetic number, because the mean of its divisors is an integer number (10005615506661).

Almost surely, 2^{20011231013321} is an apocalyptic number.

It is an amenable number.

20011231013321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011231013321 is an equidigital number, since it uses as much as digits as its factorization.

20011231013321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20011231013321 its reverse (12331013211002), we get a palindrome (32342244224323).

The spelling of 20011231013321 in words is "twenty trillion, eleven billion, two hundred thirty-one million, thirteen thousand, three hundred twenty-one".