231222212 has 12 divisors (see below), whose sum is σ = 435765036. Its totient is φ = 106717920.

The previous prime is 231222209. The next prime is 231222259. The reversal of 231222212 is 212222132.

It can be written as a sum of positive squares in 2 ways, for example, as 102535876 + 128686336 = 10126^2 + 11344^2 .

It is a super-2 number, since 2×231222212² = 106927422644345888, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2223239 + ... + 2223342.

It is an arithmetic number, because the mean of its divisors is an integer number (36313753).

Almost surely, 2^231222212 is an apocalyptic number.

It is an amenable number.

231222212 is a deficient number, since it is larger than the sum of its proper divisors (204542824).

231222212 is a wasteful number, since it uses less digits than its factorization.

231222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446598 (or 4446596 counting only the distinct ones).

The product of its digits is 192, while the sum is 17.

The square root of 231222212 is about 15205.9926344846. The cubic root of 231222212 is about 613.7759264699.

Adding to 231222212 its reverse (212222132), we get a palindrome (443444344).

The spelling of 231222212 in words is "two hundred thirty-one million, two hundred twenty-two thousand, two hundred twelve".