20122001002021 has 4 divisors (see below), whose sum is σ = 20172180556044. Its totient is φ = 20071821448000.

The previous prime is 20122001002013. The next prime is 20122001002063. The reversal of 20122001002021 is 12020010022102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18965545953025 + 1156455048996 = 4354945^2 + 1075386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122001002021 - 2³ = 20122001002013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122001001992 and 20122001002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122001005021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25089776410 + ... + 25089777211.

It is an arithmetic number, because the mean of its divisors is an integer number (5043045139011).

Almost surely, 2^{20122001002021} is an apocalyptic number.

It is an amenable number.

20122001002021 is a deficient number, since it is larger than the sum of its proper divisors (50179554023).

20122001002021 is an equidigital number, since it uses as much as digits as its factorization.

20122001002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50179554022.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20122001002021 its reverse (12020010022102), we get a palindrome (32142011024123).

The spelling of 20122001002021 in words is "twenty trillion, one hundred twenty-two billion, one million, two thousand, twenty-one".