11303123221 has 4 divisors (see below), whose sum is σ = 12172594252. Its totient is φ = 10433652192.

The previous prime is 11303123189. The next prime is 11303123239. The reversal of 11303123221 is 12232130311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12232130311 = 109 ⋅112221379.

It can be written as a sum of positive squares in 2 ways, for example, as 954130321 + 10348992900 = 30889^2 + 101730^2 .

It is a cyclic number.

It is not a de Polignac number, because 11303123221 - 2⁵ = 11303123189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11303126221) 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, 434735496 + ... + 434735521.

It is an arithmetic number, because the mean of its divisors is an integer number (3043148563).

Almost surely, 2^11303123221 is an apocalyptic number.

It is an amenable number.

11303123221 is a deficient number, since it is larger than the sum of its proper divisors (869471031).

11303123221 is an equidigital number, since it uses as much as digits as its factorization.

11303123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869471030.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 11303123221 its reverse (12232130311), we get a palindrome (23535253532).

The spelling of 11303123221 in words is "eleven billion, three hundred three million, one hundred twenty-three thousand, two hundred twenty-one".