1220036321 has 4 divisors (see below), whose sum is σ = 1394327232. Its totient is φ = 1045745412.

The previous prime is 1220036269. The next prime is 1220036327. The reversal of 1220036321 is 1236300221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220036321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220036293 and 1220036302.

It is not an unprimeable number, because it can be changed into a prime (1220036327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87145445 + ... + 87145458.

It is an arithmetic number, because the mean of its divisors is an integer number (348581808).

Almost surely, 2^1220036321 is an apocalyptic number.

It is an amenable number.

1220036321 is a deficient number, since it is larger than the sum of its proper divisors (174290911).

1220036321 is an equidigital number, since it uses as much as digits as its factorization.

1220036321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174290910.

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

The square root of 1220036321 is about 34929.0183228788. The cubic root of 1220036321 is about 1068.5403338875.

Adding to 1220036321 its reverse (1236300221), we get a palindrome (2456336542).

The spelling of 1220036321 in words is "one billion, two hundred twenty million, thirty-six thousand, three hundred twenty-one".