211021241 has 2 divisors, whose sum is σ = 211021242. Its totient is φ = 211021240.

The previous prime is 211021231. The next prime is 211021273. The reversal of 211021241 is 142120112.

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., 129299641 + 81721600 = 11371^2 + 9040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211021241 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (211021231) 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, 105510620 + 105510621.

It is an arithmetic number, because the mean of its divisors is an integer number (105510621).

Almost surely, 2^211021241 is an apocalyptic number.

It is an amenable number.

211021241 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021241 is an equidigital number, since it uses as much as digits as its factorization.

211021241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 211021241 is about 14526.5701733066. The cubic root of 211021241 is about 595.3541577263.

Adding to 211021241 its reverse (142120112), we get a palindrome (353141353).

The spelling of 211021241 in words is "two hundred eleven million, twenty-one thousand, two hundred forty-one".