11221323012 has 144 divisors (see below), whose sum is σ = 31070312000. Its totient is φ = 3531392640.

The previous prime is 11221322971. The next prime is 11221323019. The reversal of 11221323012 is 21032312211.

11221323012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (11221323019) 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 47 ways as a sum of consecutive naturals, for example, 6444462 + ... + 6446202.

Almost surely, 2^11221323012 is an apocalyptic number.

11221323012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11221323012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15535156000).

11221323012 is an abundant number, since it is smaller than the sum of its proper divisors (19848988988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11221323012 is a wasteful number, since it uses less digits than its factorization.

11221323012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128 (or 2114 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 11221323012 its reverse (21032312211), we get a palindrome (32253635223).

The spelling of 11221323012 in words is "eleven billion, two hundred twenty-one million, three hundred twenty-three thousand, twelve".