211202102020021 has 16 divisors (see below), whose sum is σ = 253851560607744. Its totient is φ = 171796026823344.

The previous prime is 211202102019991. The next prime is 211202102020027. The reversal of 211202102020021 is 120020201202112.

It is a happy number.

It is not a de Polignac number, because 211202102020021 - 2¹³ = 211202102011829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211202102019977 and 211202102020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211202102020027) 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 15 ways as a sum of consecutive naturals, for example, 5164602775 + ... + 5164643668.

It is an arithmetic number, because the mean of its divisors is an integer number (15865722537984).

Almost surely, 2^{211202102020021} is an apocalyptic number.

It is an amenable number.

211202102020021 is a deficient number, since it is larger than the sum of its proper divisors (42649458587723).

211202102020021 is a wasteful number, since it uses less digits than its factorization.

211202102020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10329246600.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211202102020021 its reverse (120020201202112), we get a palindrome (331222303222133).

The spelling of 211202102020021 in words is "two hundred eleven trillion, two hundred two billion, one hundred two million, twenty thousand, twenty-one".