211204121 has 4 divisors (see below), whose sum is σ = 211983744. Its totient is φ = 210424500.

The previous prime is 211204117. The next prime is 211204127. The reversal of 211204121 is 121402112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211204121 - 2² = 211204117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211204096 and 211204105.

It is not an unprimeable number, because it can be changed into a prime (211204127) 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 3 ways as a sum of consecutive naturals, for example, 389405 + ... + 389946.

It is an arithmetic number, because the mean of its divisors is an integer number (52995936).

Almost surely, 2^211204121 is an apocalyptic number.

It is an amenable number.

211204121 is a deficient number, since it is larger than the sum of its proper divisors (779623).

211204121 is an equidigital number, since it uses as much as digits as its factorization.

211204121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779622.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 211204121 is about 14532.8634824662. The cubic root of 211204121 is about 595.5260944945.

Adding to 211204121 its reverse (121402112), we get a palindrome (332606233).

The spelling of 211204121 in words is "two hundred eleven million, two hundred four thousand, one hundred twenty-one".