20003401121021 has 6 divisors (see below), whose sum is σ = 20716958831322. Its totient is φ = 19313628667760.

The previous prime is 20003401121003. The next prime is 20003401121027. The reversal of 20003401121021 is 12012110430002.

It can be written as a sum of positive squares in 3 ways, for example, as 9032639539225 + 10970761581796 = 3005435^2 + 3312214^2 .

It is not a de Polignac number, because 20003401121021 - 2¹⁸ = 20003400858877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20003401121027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11892627650 + ... + 11892629331.

It is an arithmetic number, because the mean of its divisors is an integer number (3452826471887).

Almost surely, 2^{20003401121021} is an apocalyptic number.

It is an amenable number.

20003401121021 is a deficient number, since it is larger than the sum of its proper divisors (713557710301).

20003401121021 is an equidigital number, since it uses as much as digits as its factorization.

20003401121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23785257039 (or 23785257010 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20003401121021 its reverse (12012110430002), we get a palindrome (32015511551023).

The spelling of 20003401121021 in words is "twenty trillion, three billion, four hundred one million, one hundred twenty-one thousand, twenty-one".