211023231 has 16 divisors (see below), whose sum is σ = 297200640. Its totient is φ = 132975360.

The previous prime is 211023221. The next prime is 211023233. The reversal of 211023231 is 132320112.

It is not a de Polignac number, because 211023231 - 2⁹ = 211022719 is a prime.

It is a super-2 number, since 2×211023231² = 89061608043358722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211023231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211023233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22386 + ... + 30383.

It is an arithmetic number, because the mean of its divisors is an integer number (18575040).

Almost surely, 2^211023231 is an apocalyptic number.

211023231 is a deficient number, since it is larger than the sum of its proper divisors (86177409).

211023231 is a wasteful number, since it uses less digits than its factorization.

211023231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52846.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 211023231 is about 14526.6386683224. The cubic root of 211023231 is about 595.3560291825.

Adding to 211023231 its reverse (132320112), we get a palindrome (343343343).

The spelling of 211023231 in words is "two hundred eleven million, twenty-three thousand, two hundred thirty-one".