20001323320321 has 16 divisors (see below), whose sum is σ = 23688297959040. Its totient is φ = 16523830028160.

The previous prime is 20001323320313. The next prime is 20001323320333. The reversal of 20001323320321 is 12302332310002.

It is not a de Polignac number, because 20001323320321 - 2³ = 20001323320313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001323320292 and 20001323320301.

It is not an unprimeable number, because it can be changed into a prime (20001323320921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86161396 + ... + 86393221.

It is an arithmetic number, because the mean of its divisors is an integer number (1480518622440).

Almost surely, 2^{20001323320321} is an apocalyptic number.

It is an amenable number.

20001323320321 is a deficient number, since it is larger than the sum of its proper divisors (3686974638719).

20001323320321 is a wasteful number, since it uses less digits than its factorization.

20001323320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172555224.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 20001323320321 its reverse (12302332310002), we get a palindrome (32303655630323).

The spelling of 20001323320321 in words is "twenty trillion, one billion, three hundred twenty-three million, three hundred twenty thousand, three hundred twenty-one".