20321013311021 has 4 divisors (see below), whose sum is σ = 20423128956000. Its totient is φ = 20218897666044.

The previous prime is 20321013310993. The next prime is 20321013311089. The reversal of 20321013311021 is 12011331012302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321013311021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20321013310984 and 20321013311002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321013313021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51057822191 + ... + 51057822588.

It is an arithmetic number, because the mean of its divisors is an integer number (5105782239000).

Almost surely, 2^{20321013311021} is an apocalyptic number.

It is an amenable number.

20321013311021 is a deficient number, since it is larger than the sum of its proper divisors (102115644979).

20321013311021 is a wasteful number, since it uses less digits than its factorization.

20321013311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102115644978.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20321013311021 its reverse (12011331012302), we get a palindrome (32332344323323).

The spelling of 20321013311021 in words is "twenty trillion, three hundred twenty-one billion, thirteen million, three hundred eleven thousand, twenty-one".