20020343040021 has 16 divisors (see below), whose sum is σ = 27429850692864. Its totient is φ = 12979249746624.

The previous prime is 20020343040013. The next prime is 20020343040031. The reversal of 20020343040021 is 12004034302002.

It is not a de Polignac number, because 20020343040021 - 2³ = 20020343040013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20020343040021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020343040031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47837325 + ... + 48254018.

It is an arithmetic number, because the mean of its divisors is an integer number (1714365668304).

Almost surely, 2^{20020343040021} is an apocalyptic number.

It is an amenable number.

20020343040021 is a deficient number, since it is larger than the sum of its proper divisors (7409507652843).

20020343040021 is a wasteful number, since it uses less digits than its factorization.

20020343040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96093260.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20020343040021 its reverse (12004034302002), we get a palindrome (32024377342023).

The spelling of 20020343040021 in words is "twenty trillion, twenty billion, three hundred forty-three million, forty thousand, twenty-one".