20021021202023 has 16 divisors (see below), whose sum is σ = 20322407043072. Its totient is φ = 19720179948000.

The previous prime is 20021021201977. The next prime is 20021021202043. The reversal of 20021021202023 is 32020212012002.

It is a cyclic number.

It is not a de Polignac number, because 20021021202023 - 2²⁶ = 20020954093159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021021201992 and 20021021202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021021202043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 609804218 + ... + 609837048.

It is an arithmetic number, because the mean of its divisors is an integer number (1270150440192).

Almost surely, 2^{20021021202023} is an apocalyptic number.

20021021202023 is a deficient number, since it is larger than the sum of its proper divisors (301385841049).

20021021202023 is a wasteful number, since it uses less digits than its factorization.

20021021202023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40846.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20021021202023 its reverse (32020212012002), we get a palindrome (52041233214025).

The spelling of 20021021202023 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred two thousand, twenty-three".