211304121 has 64 divisors (see below), whose sum is σ = 348096000. Its totient is φ = 113799168.

The previous prime is 211304117. The next prime is 211304129. The reversal of 211304121 is 121403112.

It is not a de Polignac number, because 211304121 - 2² = 211304117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211304121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211304129) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2178345 + ... + 2178441.

It is an arithmetic number, because the mean of its divisors is an integer number (5439000).

Almost surely, 2^211304121 is an apocalyptic number.

211304121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211304121 is a deficient number, since it is larger than the sum of its proper divisors (136791879).

211304121 is an equidigital number, since it uses as much as digits as its factorization.

211304121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 211304121 is about 14536.3035535173. The cubic root of 211304121 is about 595.6200686915.

Adding to 211304121 its reverse (121403112), we get a palindrome (332707233).

The spelling of 211304121 in words is "two hundred eleven million, three hundred four thousand, one hundred twenty-one".