1211221222 has 16 divisors (see below), whose sum is σ = 1828899072. Its totient is φ = 601602120.

The previous prime is 1211221213. The next prime is 1211221237. The reversal of 1211221222 is 2221221121.

It is a happy number.

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 = 1211221196 and 1211221205.

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, 187783 + ... + 194125.

It is an arithmetic number, because the mean of its divisors is an integer number (114306192).

Almost surely, 2^1211221222 is an apocalyptic number.

1211221222 is a deficient number, since it is larger than the sum of its proper divisors (617677850).

1211221222 is a wasteful number, since it uses less digits than its factorization.

1211221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963.

The product of its digits is 64, while the sum is 16.

The square root of 1211221222 is about 34802.6036669672. The cubic root of 1211221222 is about 1065.9606112399.

Adding to 1211221222 its reverse (2221221121), we get a palindrome (3432442343).

The spelling of 1211221222 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-two".