211440340 has 48 divisors (see below), whose sum is σ = 452954880. Its totient is φ = 82892160.

The previous prime is 211440319. The next prime is 211440377. The reversal of 211440340 is 43044112.

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 15 ways as a sum of consecutive naturals, for example, 257130 + ... + 257950.

It is an arithmetic number, because the mean of its divisors is an integer number (9436560).

Almost surely, 2^211440340 is an apocalyptic number.

211440340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211440340 is an abundant number, since it is smaller than the sum of its proper divisors (241514540).

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

211440340 is a wasteful number, since it uses less digits than its factorization.

211440340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 211440340 is about 14540.9882745293. The cubic root of 211440340 is about 595.7480317135.

Adding to 211440340 its reverse (43044112), we get a palindrome (254484452).

The spelling of 211440340 in words is "two hundred eleven million, four hundred forty thousand, three hundred forty".