11130231221 has 4 divisors (see below), whose sum is σ = 11182981344. Its totient is φ = 11077481100.

The previous prime is 11130231157. The next prime is 11130231223. The reversal of 11130231221 is 12213203111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12213203111 = 2339 ⋅5221549.

It is a cyclic number.

It is not a de Polignac number, because 11130231221 - 2⁶ = 11130231157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11130231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11130231223) 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, 26374745 + ... + 26375166.

It is an arithmetic number, because the mean of its divisors is an integer number (2795745336).

Almost surely, 2^11130231221 is an apocalyptic number.

It is an amenable number.

11130231221 is a deficient number, since it is larger than the sum of its proper divisors (52750123).

11130231221 is an equidigital number, since it uses as much as digits as its factorization.

11130231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52750122.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11130231221 its reverse (12213203111), we get a palindrome (23343434332).

The spelling of 11130231221 in words is "eleven billion, one hundred thirty million, two hundred thirty-one thousand, two hundred twenty-one".