211122202021 has 2 divisors, whose sum is σ = 211122202022. Its totient is φ = 211122202020.

The previous prime is 211122202009. The next prime is 211122202069. The reversal of 211122202021 is 120202221112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118225257921 + 92896944100 = 343839^2 + 304790^2 .

It is a cyclic number.

It is not a de Polignac number, because 211122202021 - 2⁵ = 211122201989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211122201986 and 211122202004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211122202091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561101010 + 105561101011.

It is an arithmetic number, because the mean of its divisors is an integer number (105561101011).

Almost surely, 2^211122202021 is an apocalyptic number.

It is an amenable number.

211122202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211122202021 is an equidigital number, since it uses as much as digits as its factorization.

211122202021 is an evil number, because the sum of its binary digits is even.

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

Adding to 211122202021 its reverse (120202221112), we get a palindrome (331324423133).

The spelling of 211122202021 in words is "two hundred eleven billion, one hundred twenty-two million, two hundred two thousand, twenty-one".