20001220000221 has 16 divisors (see below), whose sum is σ = 26834650502144. Its totient is φ = 13250984839344.

The previous prime is 20001220000193. The next prime is 20001220000261. The reversal of 20001220000221 is 12200002210002.

It is not a de Polignac number, because 20001220000221 - 2¹⁰ = 20001219999197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001220000197 and 20001220000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001220000261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2696220 + ... + 6875466.

It is an arithmetic number, because the mean of its divisors is an integer number (1677165656384).

Almost surely, 2^{20001220000221} is an apocalyptic number.

It is an amenable number.

20001220000221 is a deficient number, since it is larger than the sum of its proper divisors (6833430501923).

20001220000221 is a wasteful number, since it uses less digits than its factorization.

20001220000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4189200.

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

Adding to 20001220000221 its reverse (12200002210002), we get a palindrome (32201222210223).

The spelling of 20001220000221 in words is "twenty trillion, one billion, two hundred twenty million, two hundred twenty-one", and thus it is an aban number.