231221222 has 48 divisors (see below), whose sum is σ = 383663952. Its totient is φ = 104405760.

The previous prime is 231221209. The next prime is 231221239. The reversal of 231221222 is 222122132.

It is a self number, because there is not a number n which added to its sum of digits gives 231221222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2160893 + ... + 2160999.

It is an arithmetic number, because the mean of its divisors is an integer number (7992999).

Almost surely, 2^231221222 is an apocalyptic number.

231221222 is a deficient number, since it is larger than the sum of its proper divisors (152442730).

231221222 is a wasteful number, since it uses less digits than its factorization.

231221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 242 counting only the distinct ones).

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

The square root of 231221222 is about 15205.9600814944. The cubic root of 231221222 is about 613.7750504886.

Adding to 231221222 its reverse (222122132), we get a palindrome (453343354).

The spelling of 231221222 in words is "two hundred thirty-one million, two hundred twenty-one thousand, two hundred twenty-two".