1223421312 has 64 divisors (see below), whose sum is σ = 3255595200. Its totient is φ = 407069184.

The previous prime is 1223421299. The next prime is 1223421349. The reversal of 1223421312 is 2131243221.

It is a tau number, because it is divible by the number of its divisors (64).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235123 + ... + 240269.

It is an arithmetic number, because the mean of its divisors is an integer number (50868675).

Almost surely, 2^1223421312 is an apocalyptic number.

1223421312 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 1223421312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627797600).

1223421312 is an abundant number, since it is smaller than the sum of its proper divisors (2032173888).

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

1223421312 is an equidigital number, since it uses as much as digits as its factorization.

1223421312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5783 (or 5771 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 1223421312 is about 34977.4400435481. The cubic root of 1223421312 is about 1069.5276431383.

Adding to 1223421312 its reverse (2131243221), we get a palindrome (3354664533).

The spelling of 1223421312 in words is "one billion, two hundred twenty-three million, four hundred twenty-one thousand, three hundred twelve".