211430231 has 4 divisors (see below), whose sum is σ = 211468200. Its totient is φ = 211392264.

The previous prime is 211430227. The next prime is 211430249. The reversal of 211430231 is 132034112.

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 211430231 - 2² = 211430227 is a prime.

It is a super-2 number, since 2×211430231² = 89405485161426722, 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 (211430281) 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, 8816 + ... + 22373.

It is an arithmetic number, because the mean of its divisors is an integer number (52867050).

Almost surely, 2^211430231 is an apocalyptic number.

211430231 is a deficient number, since it is larger than the sum of its proper divisors (37969).

211430231 is an equidigital number, since it uses as much as digits as its factorization.

211430231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37968.

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

The square root of 211430231 is about 14540.6406667657. The cubic root of 211430231 is about 595.7385372893.

Adding to 211430231 its reverse (132034112), we get a palindrome (343464343).

The spelling of 211430231 in words is "two hundred eleven million, four hundred thirty thousand, two hundred thirty-one".