211411221 has 16 divisors (see below), whose sum is σ = 323117184. Its totient is φ = 120443904.

The previous prime is 211411153. The next prime is 211411231. The reversal of 211411221 is 122114112.

It is not a de Polignac number, because 211411221 - 2¹⁰ = 211410197 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211411221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211411231) 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 15 ways as a sum of consecutive naturals, for example, 7860 + ... + 22013.

It is an arithmetic number, because the mean of its divisors is an integer number (20194824).

Almost surely, 2^211411221 is an apocalyptic number.

211411221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211411221 is a deficient number, since it is larger than the sum of its proper divisors (111705963).

211411221 is a wasteful number, since it uses less digits than its factorization.

211411221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30220.

The product of its digits is 32, while the sum is 15.

The square root of 211411221 is about 14539.9869669818. The cubic root of 211411221 is about 595.7206821810.

Adding to 211411221 its reverse (122114112), we get a palindrome (333525333).

The spelling of 211411221 in words is "two hundred eleven million, four hundred eleven thousand, two hundred twenty-one".