211505011 has 2 divisors, whose sum is σ = 211505012. Its totient is φ = 211505010.

The previous prime is 211504981. The next prime is 211505027. The reversal of 211505011 is 110505112.

It is an a-pointer prime, because the next prime (211505027) can be obtained adding 211505011 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211505011 - 2⁹ = 211504499 is a prime.

It is a super-2 number, since 2×211505011² = 89468739356220242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211505071) 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, 105752505 + 105752506.

It is an arithmetic number, because the mean of its divisors is an integer number (105752506).

Almost surely, 2^211505011 is an apocalyptic number.

211505011 is a deficient number, since it is larger than the sum of its proper divisors (1).

211505011 is an equidigital number, since it uses as much as digits as its factorization.

211505011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 211505011 is about 14543.2118529574. The cubic root of 211505011 is about 595.8087638860.

The spelling of 211505011 in words is "two hundred eleven million, five hundred five thousand, eleven".