211043340 has 48 divisors (see below), whose sum is σ = 656580960. Its totient is φ = 56278080.

The previous prime is 211043309. The next prime is 211043351. The reversal of 211043340 is 43340112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194871 + ... + 195950.

It is an arithmetic number, because the mean of its divisors is an integer number (13678770).

Almost surely, 2^211043340 is an apocalyptic number.

211043340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211043340 is an abundant number, since it is smaller than the sum of its proper divisors (445537620).

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

211043340 is a wasteful number, since it uses less digits than its factorization.

211043340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390839 (or 390831 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 211043340 is about 14527.3307940585. The cubic root of 211043340 is about 595.3749396347.

Adding to 211043340 its reverse (43340112), we get a palindrome (254383452).

The spelling of 211043340 in words is "two hundred eleven million, forty-three thousand, three hundred forty".