211144140 has 72 divisors (see below), whose sum is σ = 668330208. Its totient is φ = 53856000.

The previous prime is 211144133. The next prime is 211144189. The reversal of 211144140 is 41441112.

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 23 ways as a sum of consecutive naturals, for example, 21361 + ... + 29640.

It is an arithmetic number, because the mean of its divisors is an integer number (9282364).

Almost surely, 2^211144140 is an apocalyptic number.

211144140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211144140 is an abundant number, since it is smaller than the sum of its proper divisors (457186068).

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

211144140 is a wasteful number, since it uses less digits than its factorization.

211144140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51039 (or 51034 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 211144140 is about 14530.7997027005. The cubic root of 211144140 is about 595.4697135986.

Adding to 211144140 its reverse (41441112), we get a palindrome (252585252).

The spelling of 211144140 in words is "two hundred eleven million, one hundred forty-four thousand, one hundred forty".