1123520221 has 4 divisors (see below), whose sum is σ = 1126581952. Its totient is φ = 1120458492.

The previous prime is 1123520219. The next prime is 1123520227. The reversal of 1123520221 is 1220253211.

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 cyclic number.

It is not a de Polignac number, because 1123520221 - 2¹ = 1123520219 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 (1123520227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530315 + ... + 1531048.

It is an arithmetic number, because the mean of its divisors is an integer number (281645488).

Almost surely, 2^1123520221 is an apocalyptic number.

It is an amenable number.

1123520221 is a deficient number, since it is larger than the sum of its proper divisors (3061731).

1123520221 is an equidigital number, since it uses as much as digits as its factorization.

1123520221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3061730.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1123520221 is about 33518.9531608611. The cubic root of 1123520221 is about 1039.5857019062.

Adding to 1123520221 its reverse (1220253211), we get a palindrome (2343773432).

The spelling of 1123520221 in words is "one billion, one hundred twenty-three million, five hundred twenty thousand, two hundred twenty-one".