20001010200221 has 4 divisors (see below), whose sum is σ = 20001097294332. Its totient is φ = 20000923106112.

The previous prime is 20001010200131. The next prime is 20001010200271. The reversal of 20001010200221 is 12200201010002.

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 9691702922500 + 10309307277721 = 3113150^2 + 3210811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001010200221 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 (20001010200271) 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 3 ways as a sum of consecutive naturals, for example, 43201670 + ... + 43662183.

It is an arithmetic number, because the mean of its divisors is an integer number (5000274323583).

Almost surely, 2^{20001010200221} is an apocalyptic number.

It is an amenable number.

20001010200221 is a deficient number, since it is larger than the sum of its proper divisors (87094111).

20001010200221 is an equidigital number, since it uses as much as digits as its factorization.

20001010200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87094110.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20001010200221 its reverse (12200201010002), we get a palindrome (32201211210223).

The spelling of 20001010200221 in words is "twenty trillion, one billion, ten million, two hundred thousand, two hundred twenty-one".