211047440 has 80 divisors (see below), whose sum is σ = 528686400. Its totient is φ = 78091776.

The previous prime is 211047427. The next prime is 211047443. The reversal of 211047440 is 44740112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (211047443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63746 + ... + 66974.

It is an arithmetic number, because the mean of its divisors is an integer number (6608580).

Almost surely, 2^211047440 is an apocalyptic number.

211047440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211047440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264343200).

211047440 is an abundant number, since it is smaller than the sum of its proper divisors (317638960).

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

211047440 is a wasteful number, since it uses less digits than its factorization.

211047440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304 (or 3298 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 211047440 is about 14527.4719067015. The cubic root of 211047440 is about 595.3787951167.

Adding to 211047440 its reverse (44740112), we get a palindrome (255787552).

The spelling of 211047440 in words is "two hundred eleven million, forty-seven thousand, four hundred forty".