211004240 has 20 divisors (see below), whose sum is σ = 490585044. Its totient is φ = 84401664.

The previous prime is 211004207. The next prime is 211004263. The reversal of 211004240 is 42400112.

It can be written as a sum of positive squares in 2 ways, for example, as 117765904 + 93238336 = 10852^2 + 9656^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

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, 1318697 + ... + 1318856.

Almost surely, 2^211004240 is an apocalyptic number.

211004240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211004240 is an abundant number, since it is smaller than the sum of its proper divisors (279580804).

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

211004240 is a wasteful number, since it uses less digits than its factorization.

211004240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2637566 (or 2637560 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 211004240 is about 14525.9849924196. The cubic root of 211004240 is about 595.3381689917.

Adding to 211004240 its reverse (42400112), we get a palindrome (253404352).

The spelling of 211004240 in words is "two hundred eleven million, four thousand, two hundred forty".