1220044521 has 16 divisors (see below), whose sum is σ = 1645160000. Its totient is φ = 804178368.

The previous prime is 1220044519. The next prime is 1220044531. The reversal of 1220044521 is 1254400221.

It is not a de Polignac number, because 1220044521 - 2¹ = 1220044519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220044531) 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, 159435 + ... + 166911.

It is an arithmetic number, because the mean of its divisors is an integer number (102822500).

Almost surely, 2^1220044521 is an apocalyptic number.

It is an amenable number.

1220044521 is a deficient number, since it is larger than the sum of its proper divisors (425115479).

1220044521 is a wasteful number, since it uses less digits than its factorization.

1220044521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8088.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1220044521 is about 34929.1357035928. The cubic root of 1220044521 is about 1068.5427278083.

Adding to 1220044521 its reverse (1254400221), we get a palindrome (2474444742).

The spelling of 1220044521 in words is "one billion, two hundred twenty million, forty-four thousand, five hundred twenty-one".