212831227 has 4 divisors (see below), whose sum is σ = 243235696. Its totient is φ = 182426760.

The previous prime is 212831221. The next prime is 212831243. The reversal of 212831227 is 722138212.

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 212831227 - 2²³ = 204442619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212831195 and 212831204.

It is not an unprimeable number, because it can be changed into a prime (212831221) 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 3 ways as a sum of consecutive naturals, for example, 15202224 + ... + 15202237.

It is an arithmetic number, because the mean of its divisors is an integer number (60808924).

Almost surely, 2^212831227 is an apocalyptic number.

212831227 is a deficient number, since it is larger than the sum of its proper divisors (30404469).

212831227 is an equidigital number, since it uses as much as digits as its factorization.

212831227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30404468.

The product of its digits is 2688, while the sum is 28.

The square root of 212831227 is about 14588.7363057943. The cubic root of 212831227 is about 597.0514850938.

Adding to 212831227 its reverse (722138212), we get a palindrome (934969439).

The spelling of 212831227 in words is "two hundred twelve million, eight hundred thirty-one thousand, two hundred twenty-seven".