211313221 has 16 divisors (see below), whose sum is σ = 249217920. Its totient is φ = 175403520.

The previous prime is 211313209. The next prime is 211313257. The reversal of 211313221 is 122313112.

It is a cyclic number.

It is not a de Polignac number, because 211313221 - 2⁵ = 211313189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211313195 and 211313204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211313021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37245 + ... + 42541.

It is an arithmetic number, because the mean of its divisors is an integer number (15576120).

Almost surely, 2^211313221 is an apocalyptic number.

It is an amenable number.

211313221 is a deficient number, since it is larger than the sum of its proper divisors (37904699).

211313221 is a wasteful number, since it uses less digits than its factorization.

211313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5484.

The product of its digits is 72, while the sum is 16.

The square root of 211313221 is about 14536.6165595712. The cubic root of 211313221 is about 595.6286188715.

Adding to 211313221 its reverse (122313112), we get a palindrome (333626333).

The spelling of 211313221 in words is "two hundred eleven million, three hundred thirteen thousand, two hundred twenty-one".