20021323013 has 4 divisors (see below), whose sum is σ = 20028889440. Its totient is φ = 20013756588.

The previous prime is 20021322973. The next prime is 20021323019. The reversal of 20021323013 is 31032312002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31032312002 = 2 ⋅15516156001.

It is a cyclic number.

It is not a de Polignac number, because 20021323013 - 2²⁰ = 20020274437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021322982 and 20021323000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021323019) 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, 3779243 + ... + 3784536.

It is an arithmetic number, because the mean of its divisors is an integer number (5007222360).

Almost surely, 2^20021323013 is an apocalyptic number.

It is an amenable number.

20021323013 is a deficient number, since it is larger than the sum of its proper divisors (7566427).

20021323013 is an equidigital number, since it uses as much as digits as its factorization.

20021323013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7566426.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20021323013 its reverse (31032312002), we get a palindrome (51053635015).

The spelling of 20021323013 in words is "twenty billion, twenty-one million, three hundred twenty-three thousand, thirteen".