211330221 has 8 divisors (see below), whose sum is σ = 291490080. Its totient is φ = 136028592.

The previous prime is 211330211. The next prime is 211330267. The reversal of 211330221 is 122033112.

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

It is not a de Polignac number, because 211330221 - 2¹⁰ = 211329197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211330221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211330211) 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 in 7 ways as a sum of consecutive naturals, for example, 1214455 + ... + 1214628.

It is an arithmetic number, because the mean of its divisors is an integer number (36436260).

Almost surely, 2^211330221 is an apocalyptic number.

It is an amenable number.

211330221 is a deficient number, since it is larger than the sum of its proper divisors (80159859).

211330221 is a wasteful number, since it uses less digits than its factorization.

211330221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429115.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 211330221 is about 14537.2012781003. The cubic root of 211330221 is about 595.6445910777.

Adding to 211330221 its reverse (122033112), we get a palindrome (333363333).

The spelling of 211330221 in words is "two hundred eleven million, three hundred thirty thousand, two hundred twenty-one".