211043421 has 8 divisors (see below), whose sum is σ = 312656960. Its totient is φ = 140695596.

The previous prime is 211043387. The next prime is 211043429. The reversal of 211043421 is 124340112.

211043421 is a `hidden beast` number, since 211 + 0 + 434 + 21 = 666.

It is not a de Polignac number, because 211043421 - 2¹⁰ = 211042397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211043394 and 211043403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211043429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3908185 + ... + 3908238.

It is an arithmetic number, because the mean of its divisors is an integer number (39082120).

Almost surely, 2^211043421 is an apocalyptic number.

It is an amenable number.

211043421 is a deficient number, since it is larger than the sum of its proper divisors (101613539).

211043421 is an equidigital number, since it uses as much as digits as its factorization.

211043421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7816432 (or 7816426 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 211043421 is about 14527.3335819069. Note that the first 3 decimals coincide. The cubic root of 211043421 is about 595.3750158044.

Adding to 211043421 its reverse (124340112), we get a palindrome (335383533).

The spelling of 211043421 in words is "two hundred eleven million, forty-three thousand, four hundred twenty-one".