211144231 has 4 divisors (see below), whose sum is σ = 212806912. Its totient is φ = 209481552.

The previous prime is 211144217. The next prime is 211144247. The reversal of 211144231 is 132441112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211144231 is a prime.

It is a super-2 number, since 2×211144231² = 89163772569162722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211144199 and 211144208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211144211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831150 + ... + 831403.

It is an arithmetic number, because the mean of its divisors is an integer number (53201728).

Almost surely, 2^211144231 is an apocalyptic number.

211144231 is a deficient number, since it is larger than the sum of its proper divisors (1662681).

211144231 is a wasteful number, since it uses less digits than its factorization.

211144231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662680.

The product of its digits is 192, while the sum is 19.

The square root of 211144231 is about 14530.8028339800. The cubic root of 211144231 is about 595.4697991448.

Adding to 211144231 its reverse (132441112), we get a palindrome (343585343).

The spelling of 211144231 in words is "two hundred eleven million, one hundred forty-four thousand, two hundred thirty-one".