21020013021323 has 8 divisors (see below), whose sum is σ = 21120529374720. Its totient is φ = 20919505115880.

The previous prime is 21020013021253. The next prime is 21020013021347. The reversal of 21020013021323 is 32312031002012.

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 21020013021323 - 2²⁰ = 21020011972747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020013021295 and 21020013021304.

It is not an unprimeable number, because it can be changed into a prime (21020013021373) 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, 2904686 + ... + 7104732.

It is an arithmetic number, because the mean of its divisors is an integer number (2640066171840).

Almost surely, 2^{21020013021323} is an apocalyptic number.

21020013021323 is a deficient number, since it is larger than the sum of its proper divisors (100516353397).

21020013021323 is a wasteful number, since it uses less digits than its factorization.

21020013021323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223977.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21020013021323 its reverse (32312031002012), we get a palindrome (53332044023335).

The spelling of 21020013021323 in words is "twenty-one trillion, twenty billion, thirteen million, twenty-one thousand, three hundred twenty-three".