11312122321 has 4 divisors (see below), whose sum is σ = 11907497200. Its totient is φ = 10716747444.

The previous prime is 11312122309. The next prime is 11312122387. The reversal of 11312122321 is 12322121311.

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: 12322121311 = 1259 ⋅9787229.

It is a cyclic number.

It is not a de Polignac number, because 11312122321 - 2⁷ = 11312122193 is a prime.

It is a super-3 number, since 3×11312122321³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 595374859 = 11312122321 / (1 + 1 + 3 + 1 + 2 + 1 + 2 + 2 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11312122621) 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, 297687411 + ... + 297687448.

It is an arithmetic number, because the mean of its divisors is an integer number (2976874300).

Almost surely, 2^11312122321 is an apocalyptic number.

It is an amenable number.

11312122321 is a deficient number, since it is larger than the sum of its proper divisors (595374879).

11312122321 is an equidigital number, since it uses as much as digits as its factorization.

11312122321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595374878.

The product of its digits is 144, while the sum is 19.

Adding to 11312122321 its reverse (12322121311), we get a palindrome (23634243632).

The spelling of 11312122321 in words is "eleven billion, three hundred twelve million, one hundred twenty-two thousand, three hundred twenty-one".