211143231 has 12 divisors (see below), whose sum is σ = 328445208. Its totient is φ = 129934224.

The previous prime is 211143217. The next prime is 211143253. The reversal of 211143231 is 132341112.

It is not a de Polignac number, because 211143231 - 2⁵ = 211143199 is a prime.

It is a super-2 number, since 2×211143231² = 89162927994238722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211143131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 902205 + ... + 902438.

It is an arithmetic number, because the mean of its divisors is an integer number (27370434).

Almost surely, 2^211143231 is an apocalyptic number.

211143231 is a deficient number, since it is larger than the sum of its proper divisors (117301977).

211143231 is a wasteful number, since it uses less digits than its factorization.

211143231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804662 (or 1804659 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 211143231 is about 14530.7684242782. The cubic root of 211143231 is about 595.4688590754.

Adding to 211143231 its reverse (132341112), we get a palindrome (343484343).

The spelling of 211143231 in words is "two hundred eleven million, one hundred forty-three thousand, two hundred thirty-one".