1221232321 has 8 divisors (see below), whose sum is σ = 1261029888. Its totient is φ = 1181460000.

The previous prime is 1221232319. The next prime is 1221232339. The reversal of 1221232321 is 1232321221.

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 1221232321 - 2¹ = 1221232319 is a prime.

It is a super-3 number, since 3×1221232321³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221232351) 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, 176436 + ... + 183226.

It is an arithmetic number, because the mean of its divisors is an integer number (157628736).

Almost surely, 2^1221232321 is an apocalyptic number.

It is an amenable number.

1221232321 is a deficient number, since it is larger than the sum of its proper divisors (39797567).

1221232321 is an equidigital number, since it uses as much as digits as its factorization.

1221232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12623.

The product of its digits is 288, while the sum is 19.

The square root of 1221232321 is about 34946.1345644980. The cubic root of 1221232321 is about 1068.8893827493.

Adding to 1221232321 its reverse (1232321221), we get a palindrome (2453553542).

Subtracting 1221232321 from its reverse (1232321221), we obtain a square (11088900 = 3330²).

The spelling of 1221232321 in words is "one billion, two hundred twenty-one million, two hundred thirty-two thousand, three hundred twenty-one".