211242231 has 6 divisors (see below), whose sum is σ = 305127680. Its totient is φ = 140828148.

The previous prime is 211242193. The next prime is 211242233. The reversal of 211242231 is 132242112.

It is a happy number.

211242231 is a `hidden beast` number, since 211 + 2 + 422 + 31 = 666.

It is not a de Polignac number, because 211242231 - 2⁷ = 211242103 is a prime.

It is a super-2 number, since 2×211242231² = 89246560315714722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211242233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11735671 + ... + 11735688.

Almost surely, 2^211242231 is an apocalyptic number.

211242231 is a deficient number, since it is larger than the sum of its proper divisors (93885449).

211242231 is a wasteful number, since it uses less digits than its factorization.

211242231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23471365 (or 23471362 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 211242231 is about 14534.1745895665. The cubic root of 211242231 is about 595.5619115585.

Adding to 211242231 its reverse (132242112), we get a palindrome (343484343).

The spelling of 211242231 in words is "two hundred eleven million, two hundred forty-two thousand, two hundred thirty-one".