1220321403 has 16 divisors (see below), whose sum is σ = 2066152960. Its totient is φ = 697326408.

The previous prime is 1220321371. The next prime is 1220321429. The reversal of 1220321403 is 3041230221.

It is not a de Polignac number, because 1220321403 - 2⁵ = 1220321371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220321483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3228175 + ... + 3228552.

It is an arithmetic number, because the mean of its divisors is an integer number (129134560).

Almost surely, 2^1220321403 is an apocalyptic number.

1220321403 is a deficient number, since it is larger than the sum of its proper divisors (845831557).

1220321403 is an equidigital number, since it uses as much as digits as its factorization.

1220321403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6456743 (or 6456737 counting only the distinct ones).

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

The square root of 1220321403 is about 34933.0989607278. The cubic root of 1220321403 is about 1068.6235548776.

Adding to 1220321403 its reverse (3041230221), we get a palindrome (4261551624).

The spelling of 1220321403 in words is "one billion, two hundred twenty million, three hundred twenty-one thousand, four hundred three".