1221231222 has 16 divisors (see below), whose sum is σ = 2713847280. Its totient is φ = 407077056.

The previous prime is 1221231203. The next prime is 1221231233. The reversal of 1221231222 is 2221321221.

It is a super-2 number, since 2×1221231222² = 2982811395175226568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1221231195 and 1221231204.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 11307643 + ... + 11307750.

It is an arithmetic number, because the mean of its divisors is an integer number (169615455).

Almost surely, 2^1221231222 is an apocalyptic number.

1221231222 is an abundant number, since it is smaller than the sum of its proper divisors (1492616058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221231222 is a wasteful number, since it uses less digits than its factorization.

1221231222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22615404 (or 22615398 counting only the distinct ones).

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

The square root of 1221231222 is about 34946.1188402947. The cubic root of 1221231222 is about 1068.8890621142.

Adding to 1221231222 its reverse (2221321221), we get a palindrome (3442552443).

It can be divided in two parts, 12212 and 31222, that added together give a palindrome (43434).

The spelling of 1221231222 in words is "one billion, two hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty-two".