1221323208 has 32 divisors (see below), whose sum is σ = 3489495360. Its totient is φ = 348949440.

The previous prime is 1221323203. The next prime is 1221323227. The reversal of 1221323208 is 8023231221.

It is a happy number.

It is a super-2 number, since 2×1221323208² = 2983260756798822528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1221323203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3634723 + ... + 3635058.

It is an arithmetic number, because the mean of its divisors is an integer number (109046730).

Almost surely, 2^1221323208 is an apocalyptic number.

It is an amenable number.

1221323208 is an abundant number, since it is smaller than the sum of its proper divisors (2268172152).

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

1221323208 is a wasteful number, since it uses less digits than its factorization.

1221323208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7269797 (or 7269793 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1221323208 is about 34947.4349273305. The cubic root of 1221323208 is about 1068.9158985175.

Adding to 1221323208 its reverse (8023231221), we get a palindrome (9244554429).

The spelling of 1221323208 in words is "one billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred eight".