211121243 has 2 divisors, whose sum is σ = 211121244. Its totient is φ = 211121242.

The previous prime is 211121237. The next prime is 211121257. The reversal of 211121243 is 342121112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211121243 - 2¹⁰ = 211120219 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211121203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560621 + 105560622.

It is an arithmetic number, because the mean of its divisors is an integer number (105560622).

Almost surely, 2^211121243 is an apocalyptic number.

211121243 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121243 is an equidigital number, since it uses as much as digits as its factorization.

211121243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 17.

The square root of 211121243 is about 14530.0118031611. The cubic root of 211121243 is about 595.4481880776.

Adding to 211121243 its reverse (342121112), we get a palindrome (553242355).

The spelling of 211121243 in words is "two hundred eleven million, one hundred twenty-one thousand, two hundred forty-three".