20502311002321 has 2 divisors, whose sum is σ = 20502311002322. Its totient is φ = 20502311002320.

The previous prime is 20502311002297. The next prime is 20502311002343. The reversal of 20502311002321 is 12320011320502.

It is an a-pointer prime, because the next prime (20502311002343) can be obtained adding 20502311002321 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18656041501696 + 1846269500625 = 4319264^2 + 1358775^2 .

It is a cyclic number.

It is not a de Polignac number, because 20502311002321 - 2¹⁷ = 20502310871249 is a prime.

It is a super-3 number, since 3×20502311002321³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20502311002292 and 20502311002301.

It is not a weakly prime, because it can be changed into another prime (20502311002361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251155501160 + 10251155501161.

It is an arithmetic number, because the mean of its divisors is an integer number (10251155501161).

Almost surely, 2^{20502311002321} is an apocalyptic number.

It is an amenable number.

20502311002321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502311002321 is an equidigital number, since it uses as much as digits as its factorization.

20502311002321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20502311002321 its reverse (12320011320502), we get a palindrome (32822322322823).

The spelling of 20502311002321 in words is "twenty trillion, five hundred two billion, three hundred eleven million, two thousand, three hundred twenty-one".