11312232221 has 8 divisors (see below), whose sum is σ = 11373029760. Its totient is φ = 11251592352.

The previous prime is 11312232203. The next prime is 11312232233. The reversal of 11312232221 is 12223221311.

11312232221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11312232221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11312232193 and 11312232202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11312232241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105890 + ... + 183948.

It is an arithmetic number, because the mean of its divisors is an integer number (1421628720).

Almost surely, 2^11312232221 is an apocalyptic number.

It is an amenable number.

11312232221 is a deficient number, since it is larger than the sum of its proper divisors (60797539).

11312232221 is an equidigital number, since it uses as much as digits as its factorization.

11312232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78835.

The product of its digits is 288, while the sum is 20.

Adding to 11312232221 its reverse (12223221311), we get a palindrome (23535453532).

The spelling of 11312232221 in words is "eleven billion, three hundred twelve million, two hundred thirty-two thousand, two hundred twenty-one".