211231424 has 14 divisors (see below), whose sum is σ = 419162484. Its totient is φ = 105615680.

The previous prime is 211231403. The next prime is 211231429. The reversal of 211231424 is 424132112.

It is a junction number, because it is equal to n+sod(n) for n = 211231396 and 211231405.

It is not an unprimeable number, because it can be changed into a prime (211231429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1650182 + ... + 1650309.

Almost surely, 2^211231424 is an apocalyptic number.

It is an amenable number.

211231424 is a deficient number, since it is larger than the sum of its proper divisors (207931060).

211231424 is an equidigital number, since it uses as much as digits as its factorization.

211231424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300503 (or 3300493 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 211231424 is about 14533.8028058729. The cubic root of 211231424 is about 595.5517552128.

Adding to 211231424 its reverse (424132112), we get a palindrome (635363536).

The spelling of 211231424 in words is "two hundred eleven million, two hundred thirty-one thousand, four hundred twenty-four".