20321001320021 has 16 divisors (see below), whose sum is σ = 21521474884800. Its totient is φ = 19154305621248.

The previous prime is 20321001319979. The next prime is 20321001320047. The reversal of 20321001320021 is 12002310012302.

It is a de Polignac number, because none of the positive numbers 2^k-20321001320021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321001320051) 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, 1649396 + ... + 6585021.

It is an arithmetic number, because the mean of its divisors is an integer number (1345092180300).

Almost surely, 2^{20321001320021} is an apocalyptic number.

It is an amenable number.

20321001320021 is a deficient number, since it is larger than the sum of its proper divisors (1200473564779).

20321001320021 is a wasteful number, since it uses less digits than its factorization.

20321001320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8236468.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20321001320021 its reverse (12002310012302), we get a palindrome (32323311332323).

The spelling of 20321001320021 in words is "twenty trillion, three hundred twenty-one billion, one million, three hundred twenty thousand, twenty-one".