21013320112021 has 8 divisors (see below), whose sum is σ = 21327086170880. Its totient is φ = 20699558006688.

The previous prime is 21013320112009. The next prime is 21013320112049. The reversal of 21013320112021 is 12021102331012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013320112021 - 2¹⁷ = 21013319980949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21013320112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013320112051) 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, 10755100 + ... + 12557818.

It is an arithmetic number, because the mean of its divisors is an integer number (2665885771360).

Almost surely, 2^{21013320112021} is an apocalyptic number.

It is an amenable number.

21013320112021 is a deficient number, since it is larger than the sum of its proper divisors (313766058859).

21013320112021 is a wasteful number, since it uses less digits than its factorization.

21013320112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976763.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21013320112021 its reverse (12021102331012), we get a palindrome (33034422443033).

The spelling of 21013320112021 in words is "twenty-one trillion, thirteen billion, three hundred twenty million, one hundred twelve thousand, twenty-one".