212101121 has 2 divisors, whose sum is σ = 212101122. Its totient is φ = 212101120.

The previous prime is 212101117. The next prime is 212101133. The reversal of 212101121 is 121101212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212022721 + 78400 = 14561^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 212101121 - 2² = 212101117 is a prime.

It is not a weakly prime, because it can be changed into another prime (212101171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050560 + 106050561.

It is an arithmetic number, because the mean of its divisors is an integer number (106050561).

Almost surely, 2^212101121 is an apocalyptic number.

It is an amenable number.

212101121 is a deficient number, since it is larger than the sum of its proper divisors (1).

212101121 is an equidigital number, since it uses as much as digits as its factorization.

212101121 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 212101121 is about 14563.6918739721. The cubic root of 212101121 is about 596.3679853304.

Adding to 212101121 its reverse (121101212), we get a palindrome (333202333).

Subtracting from 212101121 its reverse (121101212), we obtain a palindrome (90999909).

The spelling of 212101121 in words is "two hundred twelve million, one hundred one thousand, one hundred twenty-one".