11333231221 has 4 divisors (see below), whose sum is σ = 12205018252. Its totient is φ = 10461444192.

The previous prime is 11333231219. The next prime is 11333231251. The reversal of 11333231221 is 12213233311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3666302500 + 7666928721 = 60550^2 + 87561^2 .

It is a cyclic number.

It is not a de Polignac number, because 11333231221 - 2¹ = 11333231219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11333231192 and 11333231201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11333231251) 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, 435893496 + ... + 435893521.

It is an arithmetic number, because the mean of its divisors is an integer number (3051254563).

Almost surely, 2^11333231221 is an apocalyptic number.

It is an amenable number.

11333231221 is a deficient number, since it is larger than the sum of its proper divisors (871787031).

11333231221 is an equidigital number, since it uses as much as digits as its factorization.

11333231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871787030.

The product of its digits is 648, while the sum is 22.

Adding to 11333231221 its reverse (12213233311), we get a palindrome (23546464532).

The spelling of 11333231221 in words is "eleven billion, three hundred thirty-three million, two hundred thirty-one thousand, two hundred twenty-one".