212142231 has 24 divisors (see below), whose sum is σ = 353427360. Its totient is φ = 120108096.

The previous prime is 212142223. The next prime is 212142247. The reversal of 212142231 is 132241212.

It is a happy number.

212142231 is a `hidden beast` number, since 212 + 1 + 422 + 31 = 666.

It is not a de Polignac number, because 212142231 - 2³ = 212142223 is a prime.

It is a super-2 number, since 2×212142231² = 90008652347314722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212142211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8580 + ... + 22313.

It is an arithmetic number, because the mean of its divisors is an integer number (14726140).

Almost surely, 2^212142231 is an apocalyptic number.

212142231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212142231 is a deficient number, since it is larger than the sum of its proper divisors (141285129).

212142231 is a wasteful number, since it uses less digits than its factorization.

212142231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31015 (or 31012 counting only the distinct ones).

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

The square root of 212142231 is about 14565.1031922194. The cubic root of 212142231 is about 596.4065127145.

Adding to 212142231 its reverse (132241212), we get a palindrome (344383443).

The spelling of 212142231 in words is "two hundred twelve million, one hundred forty-two thousand, two hundred thirty-one".