1043505221 has 4 divisors (see below), whose sum is σ = 1138369344. Its totient is φ = 948641100.

The previous prime is 1043505163. The next prime is 1043505263. The reversal of 1043505221 is 1225053401.

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 de Polignac number, because none of the positive numbers 2^k-1043505221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043505721) 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, 47432045 + ... + 47432066.

It is an arithmetic number, because the mean of its divisors is an integer number (284592336).

Almost surely, 2^1043505221 is an apocalyptic number.

1043505221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1043505221 is a deficient number, since it is larger than the sum of its proper divisors (94864123).

1043505221 is an equidigital number, since it uses as much as digits as its factorization.

1043505221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94864122.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1043505221 is about 32303.3314226257. The cubic root of 1043505221 is about 1014.2963798606.

Adding to 1043505221 its reverse (1225053401), we get a palindrome (2268558622).

The spelling of 1043505221 in words is "one billion, forty-three million, five hundred five thousand, two hundred twenty-one".