20000221002001 has 4 divisors (see below), whose sum is σ = 21176704590372. Its totient is φ = 18823737413632.

The previous prime is 20000221001987. The next prime is 20000221002007. The reversal of 20000221002001 is 10020012200002.

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 16950224214225 + 3049996787776 = 4117065^2 + 1746424^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000221002001 - 2³⁵ = 19965861263633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20000221002007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588241794160 + ... + 588241794193.

It is an arithmetic number, because the mean of its divisors is an integer number (5294176147593).

Almost surely, 2^{20000221002001} is an apocalyptic number.

It is an amenable number.

20000221002001 is a deficient number, since it is larger than the sum of its proper divisors (1176483588371).

20000221002001 is a wasteful number, since it uses less digits than its factorization.

20000221002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176483588370.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20000221002001 its reverse (10020012200002), we get a palindrome (30020233202003).

The spelling of 20000221002001 in words is "twenty trillion, two hundred twenty-one million, two thousand, one".