211041421 has 4 divisors (see below), whose sum is σ = 215531712. Its totient is φ = 206551132.

The previous prime is 211041401. The next prime is 211041427. The reversal of 211041421 is 124140112.

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 211041421 - 2⁷ = 211041293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211041395 and 211041404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211041427) 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, 2245075 + ... + 2245168.

It is an arithmetic number, because the mean of its divisors is an integer number (53882928).

Almost surely, 2^211041421 is an apocalyptic number.

It is an amenable number.

211041421 is a deficient number, since it is larger than the sum of its proper divisors (4490291).

211041421 is an equidigital number, since it uses as much as digits as its factorization.

211041421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4490290.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 211041421 is about 14527.2647459871. The cubic root of 211041421 is about 595.3731350638.

Adding to 211041421 its reverse (124140112), we get a palindrome (335181533).

The spelling of 211041421 in words is "two hundred eleven million, forty-one thousand, four hundred twenty-one".