11428317221 has 4 divisors (see below), whose sum is σ = 11535124032. Its totient is φ = 11321510412.

The previous prime is 11428317203. The next prime is 11428317259. The reversal of 11428317221 is 12271382411.

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 a de Polignac number, because none of the positive numbers 2^k-11428317221 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 (11428317821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53403245 + ... + 53403458.

It is an arithmetic number, because the mean of its divisors is an integer number (2883781008).

Almost surely, 2^11428317221 is an apocalyptic number.

It is an amenable number.

11428317221 is a deficient number, since it is larger than the sum of its proper divisors (106806811).

11428317221 is a wasteful number, since it uses less digits than its factorization.

11428317221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106806810.

The product of its digits is 5376, while the sum is 32.

Adding to 11428317221 its reverse (12271382411), we get a palindrome (23699699632).

The spelling of 11428317221 in words is "eleven billion, four hundred twenty-eight million, three hundred seventeen thousand, two hundred twenty-one".