211303121 has 2 divisors, whose sum is σ = 211303122. Its totient is φ = 211303120.

The previous prime is 211303111. The next prime is 211303129. The reversal of 211303121 is 121303112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139240000 + 72063121 = 11800^2 + 8489^2 .

It is a cyclic number.

It is not a de Polignac number, because 211303121 - 2²² = 207108817 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 211303096 and 211303105.

It is not a weakly prime, because it can be changed into another prime (211303129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105651560 + 105651561.

It is an arithmetic number, because the mean of its divisors is an integer number (105651561).

Almost surely, 2^211303121 is an apocalyptic number.

It is an amenable number.

211303121 is a deficient number, since it is larger than the sum of its proper divisors (1).

211303121 is an equidigital number, since it uses as much as digits as its factorization.

211303121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 211303121 is about 14536.2691568366. The cubic root of 211303121 is about 595.6191290963.

Adding to 211303121 its reverse (121303112), we get a palindrome (332606233).

Subtracting from 211303121 its reverse (121303112), we obtain a palindrome (90000009).

The spelling of 211303121 in words is "two hundred eleven million, three hundred three thousand, one hundred twenty-one".