211202202112021 has 2 divisors, whose sum is σ = 211202202112022. Its totient is φ = 211202202112020.

The previous prime is 211202202112001. The next prime is 211202202112043. The reversal of 211202202112021 is 120211202202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112605523980625 + 98596678131396 = 10611575^2 + 9929586^2 .

It is a cyclic number.

It is not a de Polignac number, because 211202202112021 - 2¹⁹ = 211202201587733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211202202112021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211202202112001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105601101056010 + 105601101056011.

It is an arithmetic number, because the mean of its divisors is an integer number (105601101056011).

Almost surely, 2^{211202202112021} is an apocalyptic number.

It is an amenable number.

211202202112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211202202112021 is an equidigital number, since it uses as much as digits as its factorization.

211202202112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211202202112021 its reverse (120211202202112), we get a palindrome (331413404314133).

Subtracting from 211202202112021 its reverse (120211202202112), we obtain a palindrome (90990999909909).

The spelling of 211202202112021 in words is "two hundred eleven trillion, two hundred two billion, two hundred two million, one hundred twelve thousand, twenty-one".