20021200211101 has 2 divisors, whose sum is σ = 20021200211102. Its totient is φ = 20021200211100.

The previous prime is 20021200211099. The next prime is 20021200211209. The reversal of 20021200211101 is 10111200212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20020022691876 + 1177519225 = 4474374^2 + 34315^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021200211101 - 2¹ = 20021200211099 is a prime.

Together with 20021200211099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021200211501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010600105550 + 10010600105551.

It is an arithmetic number, because the mean of its divisors is an integer number (10010600105551).

Almost surely, 2^{20021200211101} is an apocalyptic number.

It is an amenable number.

20021200211101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021200211101 is an equidigital number, since it uses as much as digits as its factorization.

20021200211101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20021200211101 its reverse (10111200212002), we get a palindrome (30132400423103).

Subtracting from 20021200211101 its reverse (10111200212002), we obtain a palindrome (9909999999099).

The spelling of 20021200211101 in words is "twenty trillion, twenty-one billion, two hundred million, two hundred eleven thousand, one hundred one".