1220232321 has 24 divisors (see below), whose sum is σ = 2197475904. Its totient is φ = 633886560.

The previous prime is 1220232319. The next prime is 1220232329. The reversal of 1220232321 is 1232320221.

It is not a de Polignac number, because 1220232321 - 2¹ = 1220232319 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220232294 and 1220232303.

It is not an unprimeable number, because it can be changed into a prime (1220232329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 879706 + ... + 881091.

It is an arithmetic number, because the mean of its divisors is an integer number (91561496).

Almost surely, 2^1220232321 is an apocalyptic number.

1220232321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220232321 is a deficient number, since it is larger than the sum of its proper divisors (977243583).

1220232321 is a wasteful number, since it uses less digits than its factorization.

1220232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760821 (or 1760818 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1220232321 is about 34931.8239002775. The cubic root of 1220232321 is about 1068.5975514985.

Adding to 1220232321 its reverse (1232320221), we get a palindrome (2452552542).

The spelling of 1220232321 in words is "one billion, two hundred twenty million, two hundred thirty-two thousand, three hundred twenty-one".