211304231 has 4 divisors (see below), whose sum is σ = 211407000. Its totient is φ = 211201464.

The previous prime is 211304209. The next prime is 211304257. The reversal of 211304231 is 132403112.

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

It is a cyclic number.

It is not a de Polignac number, because 211304231 - 2²² = 207109927 is a prime.

It is a super-2 number, since 2×211304231² = 89298956077002722, 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 (211304281) 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, 48236 + ... + 52433.

It is an arithmetic number, because the mean of its divisors is an integer number (52851750).

Almost surely, 2^211304231 is an apocalyptic number.

211304231 is a deficient number, since it is larger than the sum of its proper divisors (102769).

211304231 is a wasteful number, since it uses less digits than its factorization.

211304231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102768.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 211304231 is about 14536.3073371472. The cubic root of 211304231 is about 595.6201720468.

Adding to 211304231 its reverse (132403112), we get a palindrome (343707343).

The spelling of 211304231 in words is "two hundred eleven million, three hundred four thousand, two hundred thirty-one".