20011202102321 has 2 divisors, whose sum is σ = 20011202102322. Its totient is φ = 20011202102320.

The previous prime is 20011202102267. The next prime is 20011202102323. The reversal of 20011202102321 is 12320120211002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15527035870096 + 4484166232225 = 3940436^2 + 2117585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011202102321 is a prime.

Together with 20011202102323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011202102321.

It is not a weakly prime, because it can be changed into another prime (20011202102323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005601051160 + 10005601051161.

It is an arithmetic number, because the mean of its divisors is an integer number (10005601051161).

Almost surely, 2^{20011202102321} is an apocalyptic number.

It is an amenable number.

20011202102321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011202102321 is an equidigital number, since it uses as much as digits as its factorization.

20011202102321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20011202102321 its reverse (12320120211002), we get a palindrome (32331322313323).

The spelling of 20011202102321 in words is "twenty trillion, eleven billion, two hundred two million, one hundred two thousand, three hundred twenty-one".