211605229 has 8 divisors (see below), whose sum is σ = 234288288. Its totient is φ = 189496560.

The previous prime is 211605197. The next prime is 211605253. The reversal of 211605229 is 922506112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211605229 - 2⁵ = 211605197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211605197 and 211605206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211605259) 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 in 7 ways as a sum of consecutive naturals, for example, 142822 + ... + 144295.

It is an arithmetic number, because the mean of its divisors is an integer number (29286036).

Almost surely, 2^211605229 is an apocalyptic number.

It is an amenable number.

211605229 is a deficient number, since it is larger than the sum of its proper divisors (22683059).

211605229 is a wasteful number, since it uses less digits than its factorization.

211605229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287195.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 211605229 is about 14546.6569699021. The cubic root of 211605229 is about 595.9028535941.

The spelling of 211605229 in words is "two hundred eleven million, six hundred five thousand, two hundred twenty-nine".