1221303222 has 48 divisors (see below), whose sum is σ = 2805697440. Its totient is φ = 382622976.

The previous prime is 1221303191. The next prime is 1221303227. The reversal of 1221303222 is 2223031221.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221303195 and 1221303204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221303227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 258679 + ... + 263357.

It is an arithmetic number, because the mean of its divisors is an integer number (58452030).

Almost surely, 2^1221303222 is an apocalyptic number.

1221303222 is an abundant number, since it is smaller than the sum of its proper divisors (1584394218).

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

1221303222 is a wasteful number, since it uses less digits than its factorization.

1221303222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5557 (or 5554 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1221303222 is about 34947.1489824277. The cubic root of 1221303222 is about 1068.9100678279.

Adding to 1221303222 its reverse (2223031221), we get a palindrome (3444334443).

The spelling of 1221303222 in words is "one billion, two hundred twenty-one million, three hundred three thousand, two hundred twenty-two".