211434240 has 72 divisors (see below), whose sum is σ = 675280368. Its totient is φ = 56381440.

The previous prime is 211434233. The next prime is 211434241. The reversal of 211434240 is 42434112.

It is not an unprimeable number, because it can be changed into a prime (211434241) 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 in 7 ways as a sum of consecutive naturals, for example, 23691 + ... + 31370.

It is an arithmetic number, because the mean of its divisors is an integer number (9378894).

Almost surely, 2^211434240 is an apocalyptic number.

211434240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211434240 is an abundant number, since it is smaller than the sum of its proper divisors (463846128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211434240 is an equidigital number, since it uses as much as digits as its factorization.

211434240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55085 (or 55071 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 211434240 is about 14540.7785211109. The cubic root of 211434240 is about 595.7423025987.

Adding to 211434240 its reverse (42434112), we get a palindrome (253868352).

The spelling of 211434240 in words is "two hundred eleven million, four hundred thirty-four thousand, two hundred forty".