11323211221 has 8 divisors (see below), whose sum is σ = 12944058560. Its totient is φ = 9703175328.

The previous prime is 11323211219. The next prime is 11323211261. The reversal of 11323211221 is 12211232311.

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

It is not a de Polignac number, because 11323211221 - 2¹ = 11323211219 is a prime.

It is a super-2 number, since 2×11323211221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11323211261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172656 + ... + 229033.

It is an arithmetic number, because the mean of its divisors is an integer number (1618007320).

Almost surely, 2^11323211221 is an apocalyptic number.

It is an amenable number.

11323211221 is a deficient number, since it is larger than the sum of its proper divisors (1620847339).

11323211221 is an equidigital number, since it uses as much as digits as its factorization.

11323211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405723.

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

Adding to 11323211221 its reverse (12211232311), we get a palindrome (23534443532).

The spelling of 11323211221 in words is "eleven billion, three hundred twenty-three million, two hundred eleven thousand, two hundred twenty-one".