211221233 has 8 divisors (see below), whose sum is σ = 223470720. Its totient is φ = 199085040.

The previous prime is 211221229. The next prime is 211221247. The reversal of 211221233 is 332122112.

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

It is not a de Polignac number, because 211221233 - 2² = 211221229 is a prime.

It is a super-2 number, since 2×211221233² = 89228818540080578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221533) 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, 24473 + ... + 31958.

It is an arithmetic number, because the mean of its divisors is an integer number (27933840).

Almost surely, 2^211221233 is an apocalyptic number.

It is an amenable number.

211221233 is a deficient number, since it is larger than the sum of its proper divisors (12249487).

211221233 is a wasteful number, since it uses less digits than its factorization.

211221233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56647.

The product of its digits is 144, while the sum is 17.

The square root of 211221233 is about 14533.4522051714. The cubic root of 211221233 is about 595.5421774625.

Adding to 211221233 its reverse (332122112), we get a palindrome (543343345).

The spelling of 211221233 in words is "two hundred eleven million, two hundred twenty-one thousand, two hundred thirty-three".