1220324321 has 4 divisors (see below), whose sum is σ = 1262404500. Its totient is φ = 1178244144.

The previous prime is 1220324299. The next prime is 1220324323. The reversal of 1220324321 is 1234230221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1234230221 = 7 ⋅176318603.

It can be written as a sum of positive squares in 2 ways, for example, as 463799296 + 756525025 = 21536^2 + 27505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220324321 is a prime.

It is a super-2 number, since 2×1220324321² = 2978382896848222082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220324293 and 1220324302.

It is not an unprimeable number, because it can be changed into a prime (1220324323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21040046 + ... + 21040103.

It is an arithmetic number, because the mean of its divisors is an integer number (315601125).

Almost surely, 2^1220324321 is an apocalyptic number.

It is an amenable number.

1220324321 is a deficient number, since it is larger than the sum of its proper divisors (42080179).

1220324321 is an equidigital number, since it uses as much as digits as its factorization.

1220324321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42080178.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1220324321 is about 34933.1407262502. The cubic root of 1220324321 is about 1068.6244066316.

Adding to 1220324321 its reverse (1234230221), we get a palindrome (2454554542).

The spelling of 1220324321 in words is "one billion, two hundred twenty million, three hundred twenty-four thousand, three hundred twenty-one".