1321222452 has 96 divisors (see below), whose sum is σ = 3457327104. Its totient is φ = 389270400.

The previous prime is 1321222451. The next prime is 1321222453. The reversal of 1321222452 is 2542221231.

It is an interprime number because it is at equal distance from previous prime (1321222451) and next prime (1321222453).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321222451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1072677 + ... + 1073907.

It is an arithmetic number, because the mean of its divisors is an integer number (36013824).

Almost surely, 2^1321222452 is an apocalyptic number.

1321222452 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 1321222452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1728663552).

1321222452 is an abundant number, since it is smaller than the sum of its proper divisors (2136104652).

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

1321222452 is a wasteful number, since it uses less digits than its factorization.

1321222452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469 (or 1467 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 1321222452 is about 36348.6237978826. The cubic root of 1321222452 is about 1097.2998379611.

Adding to 1321222452 its reverse (2542221231), we get a palindrome (3863443683).

The spelling of 1321222452 in words is "one billion, three hundred twenty-one million, two hundred twenty-two thousand, four hundred fifty-two".