1221323232 has 72 divisors (see below), whose sum is σ = 3295317816. Its totient is φ = 396062208.

The previous prime is 1221323227. The next prime is 1221323239. The reversal of 1221323232 is 2323231221.

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 = 1221323199 and 1221323208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221323239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126778 + ... + 136070.

It is an arithmetic number, because the mean of its divisors is an integer number (45768303).

Almost surely, 2^1221323232 is an apocalyptic number.

1221323232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221323232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1647658908).

1221323232 is an abundant number, since it is smaller than the sum of its proper divisors (2073994584).

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

1221323232 is an equidigital number, since it uses as much as digits as its factorization.

1221323232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9380 (or 9335 counting only the distinct ones).

The product of its digits is 864, while the sum is 21.

The square root of 1221323232 is about 34947.4352707033. The cubic root of 1221323232 is about 1068.9159055192.

Adding to 1221323232 its reverse (2323231221), we get a palindrome (3544554453).

The spelling of 1221323232 in words is "one billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred thirty-two".