211542113 has 2 divisors, whose sum is σ = 211542114. Its totient is φ = 211542112.

The previous prime is 211542031. The next prime is 211542137. The reversal of 211542113 is 311245112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211498849 + 43264 = 14543^2 + 208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211542113 is a prime.

It is not a weakly prime, because it can be changed into another prime (211542173) 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, 105771056 + 105771057.

It is an arithmetic number, because the mean of its divisors is an integer number (105771057).

Almost surely, 2^211542113 is an apocalyptic number.

It is an amenable number.

211542113 is a deficient number, since it is larger than the sum of its proper divisors (1).

211542113 is an equidigital number, since it uses as much as digits as its factorization.

211542113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 211542113 is about 14544.4873749473. The cubic root of 211542113 is about 595.8436005773.

Adding to 211542113 its reverse (311245112), we get a palindrome (522787225).

The spelling of 211542113 in words is "two hundred eleven million, five hundred forty-two thousand, one hundred thirteen".