1212221222 has 8 divisors (see below), whose sum is σ = 1837077816. Its totient is φ = 599861952.

The previous prime is 1212221221. The next prime is 1212221243. The reversal of 1212221222 is 2221222121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1212221222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3124088 + ... + 3124475.

It is an arithmetic number, because the mean of its divisors is an integer number (229634727).

Almost surely, 2^1212221222 is an apocalyptic number.

1212221222 is a deficient number, since it is larger than the sum of its proper divisors (624856594).

1212221222 is an equidigital number, since it uses as much as digits as its factorization.

1212221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6248662.

The product of its digits is 128, while the sum is 17.

The square root of 1212221222 is about 34816.9674440495. The cubic root of 1212221222 is about 1066.2538875271.

Adding to 1212221222 its reverse (2221222121), we get a palindrome (3433443343).

It can be divided in two parts, 121 and 2221222, that multiplied together give a palindrome (268767862).

The spelling of 1212221222 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-two".