211881140 has 12 divisors (see below), whose sum is σ = 444950436. Its totient is φ = 84752448.

The previous prime is 211881139. The next prime is 211881151. The reversal of 211881140 is 41188112.

It can be written as a sum of positive squares in 2 ways, for example, as 39589264 + 172291876 = 6292^2 + 13126^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5297009 + ... + 5297048.

It is an arithmetic number, because the mean of its divisors is an integer number (37079203).

Almost surely, 2^211881140 is an apocalyptic number.

211881140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211881140 is an abundant number, since it is smaller than the sum of its proper divisors (233069296).

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

211881140 is a wasteful number, since it uses less digits than its factorization.

211881140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10594066 (or 10594064 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 26.

The square root of 211881140 is about 14556.1375371353. The cubic root of 211881140 is about 596.1617393571.

The spelling of 211881140 in words is "two hundred eleven million, eight hundred eighty-one thousand, one hundred forty".