211206055 has 4 divisors (see below), whose sum is σ = 253447272. Its totient is φ = 168964840.

The previous prime is 211206053. The next prime is 211206091. The reversal of 211206055 is 550602112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 211206055 - 2¹ = 211206053 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211206053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21120601 + ... + 21120610.

It is an arithmetic number, because the mean of its divisors is an integer number (63361818).

Almost surely, 2^211206055 is an apocalyptic number.

211206055 is a deficient number, since it is larger than the sum of its proper divisors (42241217).

211206055 is an equidigital number, since it uses as much as digits as its factorization.

211206055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42241216.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 211206055 is about 14532.9300211623. The cubic root of 211206055 is about 595.5279122368.

Adding to 211206055 its reverse (550602112), we get a palindrome (761808167).

The spelling of 211206055 in words is "two hundred eleven million, two hundred six thousand, fifty-five".