20321123343313 has 16 divisors (see below), whose sum is σ = 21936194899920. Its totient is φ = 18713519529984.

The previous prime is 20321123343299. The next prime is 20321123343329. The reversal of 20321123343313 is 31334332112302.

It can be written as a sum of positive squares in 8 ways, for example, as 6239544376464 + 14081578966849 = 2497908^2 + 3752543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321123343313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321120343313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8247145 + ... + 10423897.

It is an arithmetic number, because the mean of its divisors is an integer number (1371012181245).

Almost surely, 2^{20321123343313} is an apocalyptic number.

It is an amenable number.

20321123343313 is a deficient number, since it is larger than the sum of its proper divisors (1615071556607).

20321123343313 is a wasteful number, since it uses less digits than its factorization.

20321123343313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178468.

The product of its (nonzero) digits is 23328, while the sum is 31.

Adding to 20321123343313 its reverse (31334332112302), we get a palindrome (51655455455615).

The spelling of 20321123343313 in words is "twenty trillion, three hundred twenty-one billion, one hundred twenty-three million, three hundred forty-three thousand, three hundred thirteen".