20321013202121 has 8 divisors (see below), whose sum is σ = 20610292147200. Its totient is φ = 20031819465280.

The previous prime is 20321013202111. The next prime is 20321013202177. The reversal of 20321013202121 is 12120231012302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321013202121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20321013202093 and 20321013202102.

It is not an unprimeable number, because it can be changed into a prime (20321013202111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20821616 + ... + 21775713.

It is an arithmetic number, because the mean of its divisors is an integer number (2576286518400).

Almost surely, 2^{20321013202121} is an apocalyptic number.

It is an amenable number.

20321013202121 is a deficient number, since it is larger than the sum of its proper divisors (289278945079).

20321013202121 is an equidigital number, since it uses as much as digits as its factorization.

20321013202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42604119.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20321013202121 its reverse (12120231012302), we get a palindrome (32441244214423).

The spelling of 20321013202121 in words is "twenty trillion, three hundred twenty-one billion, thirteen million, two hundred two thousand, one hundred twenty-one".