11333333221 has 4 divisors (see below), whose sum is σ = 12952380832. Its totient is φ = 9714285612.

The previous prime is 11333333213. The next prime is 11333333243. The reversal of 11333333221 is 12233333311.

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: 12233333311 = 23 ⋅531884057.

It is a cyclic number.

It is not a de Polignac number, because 11333333221 - 2³ = 11333333213 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 (11333333251) 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, 809523795 + ... + 809523808.

It is an arithmetic number, because the mean of its divisors is an integer number (3238095208).

Almost surely, 2^11333333221 is an apocalyptic number.

It is an amenable number.

11333333221 is a deficient number, since it is larger than the sum of its proper divisors (1619047611).

11333333221 is an equidigital number, since it uses as much as digits as its factorization.

11333333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619047610.

The product of its digits is 2916, while the sum is 25.

Adding to 11333333221 its reverse (12233333311), we get a palindrome (23566666532).

The spelling of 11333333221 in words is "eleven billion, three hundred thirty-three million, three hundred thirty-three thousand, two hundred twenty-one".