1043521220 has 24 divisors (see below), whose sum is σ = 2504451264. Its totient is φ = 357778656.

The previous prime is 1043521189. The next prime is 1043521223. The reversal of 1043521220 is 221253401.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1043521192 and 1043521201.

It is not an unprimeable number, because it can be changed into a prime (1043521223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3726722 + ... + 3727001.

It is an arithmetic number, because the mean of its divisors is an integer number (104352136).

Almost surely, 2^1043521220 is an apocalyptic number.

1043521220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1043521220 is an abundant number, since it is smaller than the sum of its proper divisors (1460930044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1043521220 is a wasteful number, since it uses less digits than its factorization.

1043521220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7453739 (or 7453737 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1043521220 is about 32303.5790586740. The cubic root of 1043521220 is about 1014.3015635577.

Adding to 1043521220 its reverse (221253401), we get a palindrome (1264774621).

The spelling of 1043521220 in words is "one billion, forty-three million, five hundred twenty-one thousand, two hundred twenty".