211534231 has 8 divisors (see below), whose sum is σ = 213413760. Its totient is φ = 209660088.

The previous prime is 211534189. The next prime is 211534237. The reversal of 211534231 is 132435112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211534231 - 2¹⁵ = 211501463 is a prime.

It is a super-2 number, since 2×211534231² = 89493461769522722, 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 (211534237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130830 + ... + 132436.

It is an arithmetic number, because the mean of its divisors is an integer number (26676720).

Almost surely, 2^211534231 is an apocalyptic number.

211534231 is a deficient number, since it is larger than the sum of its proper divisors (1879529).

211534231 is a wasteful number, since it uses less digits than its factorization.

211534231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693.

The product of its digits is 720, while the sum is 22.

The square root of 211534231 is about 14544.2164106562. The cubic root of 211534231 is about 595.8362001633.

Adding to 211534231 its reverse (132435112), we get a palindrome (343969343).

The spelling of 211534231 in words is "two hundred eleven million, five hundred thirty-four thousand, two hundred thirty-one".