1221332321 has 8 divisors (see below), whose sum is σ = 1332633600. Its totient is φ = 1110076240.

The previous prime is 1221332263. The next prime is 1221332339. The reversal of 1221332321 is 1232331221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221332321 - 2¹⁰ = 1221331297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221332293 and 1221332302.

It is not an unprimeable number, because it can be changed into a prime (1221334321) 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, 71840 + ... + 87198.

It is an arithmetic number, because the mean of its divisors is an integer number (166579200).

Almost surely, 2^1221332321 is an apocalyptic number.

1221332321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221332321 is a deficient number, since it is larger than the sum of its proper divisors (111301279).

1221332321 is a wasteful number, since it uses less digits than its factorization.

1221332321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22599.

The product of its digits is 432, while the sum is 20.

The square root of 1221332321 is about 34947.5653086163. The cubic root of 1221332321 is about 1068.9185571112.

Adding to 1221332321 its reverse (1232331221), we get a palindrome (2453663542).

The spelling of 1221332321 in words is "one billion, two hundred twenty-one million, three hundred thirty-two thousand, three hundred twenty-one".