211122101 has 2 divisors, whose sum is σ = 211122102. Its totient is φ = 211122100.

The previous prime is 211122097. The next prime is 211122137. The reversal of 211122101 is 101221112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151044100 + 60078001 = 12290^2 + 7751^2 .

It is a cyclic number.

It is not a de Polignac number, because 211122101 - 2² = 211122097 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211122601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561050 + 105561051.

It is an arithmetic number, because the mean of its divisors is an integer number (105561051).

Almost surely, 2^211122101 is an apocalyptic number.

It is an amenable number.

211122101 is a deficient number, since it is larger than the sum of its proper divisors (1).

211122101 is an equidigital number, since it uses as much as digits as its factorization.

211122101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 211122101 is about 14530.0413282275. The cubic root of 211122101 is about 595.4489947133.

Adding to 211122101 its reverse (101221112), we get a palindrome (312343213).

The spelling of 211122101 in words is "two hundred eleven million, one hundred twenty-two thousand, one hundred one".