20001020202021 has 8 divisors (see below), whose sum is σ = 26668096927200. Its totient is φ = 13333978472432.

The previous prime is 20001020202019. The next prime is 20001020202073. The reversal of 20001020202021 is 12020202010002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001020202021 - 2¹ = 20001020202019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20001020201988 and 20001020202006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001020202001) 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 7 ways as a sum of consecutive naturals, for example, 7384950 + ... + 9723143.

It is an arithmetic number, because the mean of its divisors is an integer number (3333512115900).

Almost surely, 2^{20001020202021} is an apocalyptic number.

It is an amenable number.

20001020202021 is a deficient number, since it is larger than the sum of its proper divisors (6667076725179).

20001020202021 is a wasteful number, since it uses less digits than its factorization.

20001020202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17497795.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20001020202021 its reverse (12020202010002), we get a palindrome (32021222212023).

The spelling of 20001020202021 in words is "twenty trillion, one billion, twenty million, two hundred two thousand, twenty-one".