20403332122021 has 2 divisors, whose sum is σ = 20403332122022. Its totient is φ = 20403332122020.

The previous prime is 20403332121971. The next prime is 20403332122157. The reversal of 20403332122021 is 12022123330402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20373442553025 + 29889568996 = 4513695^2 + 172886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403332122021 - 2⁹ = 20403332121509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403332129021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201666061010 + 10201666061011.

It is an arithmetic number, because the mean of its divisors is an integer number (10201666061011).

Almost surely, 2^{20403332122021} is an apocalyptic number.

It is an amenable number.

20403332122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403332122021 is an equidigital number, since it uses as much as digits as its factorization.

20403332122021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 20403332122021 its reverse (12022123330402), we get a palindrome (32425455452423).

The spelling of 20403332122021 in words is "twenty trillion, four hundred three billion, three hundred thirty-two million, one hundred twenty-two thousand, twenty-one".