1220221443 has 16 divisors (see below), whose sum is σ = 1865260800. Its totient is φ = 695066016.

The previous prime is 1220221433. The next prime is 1220221451. The reversal of 1220221443 is 3441220221.

It is not a de Polignac number, because 1220221443 - 2¹⁶ = 1220155907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1220221433) 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 15 ways as a sum of consecutive naturals, for example, 84993 + ... + 98306.

It is an arithmetic number, because the mean of its divisors is an integer number (116578800).

Almost surely, 2^1220221443 is an apocalyptic number.

1220221443 is a deficient number, since it is larger than the sum of its proper divisors (645039357).

1220221443 is a wasteful number, since it uses less digits than its factorization.

1220221443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183626.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1220221443 is about 34931.6681966378. The cubic root of 1220221443 is about 1068.5943760817.

Adding to 1220221443 its reverse (3441220221), we get a palindrome (4661441664).

The spelling of 1220221443 in words is "one billion, two hundred twenty million, two hundred twenty-one thousand, four hundred forty-three".