211143220 has 24 divisors (see below), whose sum is σ = 462680064. Its totient is φ = 80785056.

The previous prime is 211143217. The next prime is 211143253. The reversal of 211143220 is 22341112.

211143220 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

211143220 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 211143194 and 211143203.

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 7 ways as a sum of consecutive naturals, for example, 229044 + ... + 229963.

It is an arithmetic number, because the mean of its divisors is an integer number (19278336).

Almost surely, 2^211143220 is an apocalyptic number.

211143220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211143220 is an abundant number, since it is smaller than the sum of its proper divisors (251536844).

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

211143220 is a wasteful number, since it uses less digits than its factorization.

211143220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459039 (or 459037 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 211143220 is about 14530.7680457710. The cubic root of 211143220 is about 595.4688487346.

Adding to 211143220 its reverse (22341112), we get a palindrome (233484332).

The spelling of 211143220 in words is "two hundred eleven million, one hundred forty-three thousand, two hundred twenty".