12211443440 has 40 divisors (see below), whose sum is σ = 32447551200. Its totient is φ = 4186780416.

The previous prime is 12211443437. The next prime is 12211443449. The reversal of 12211443440 is 4434411221.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211443449) 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, 10902515 + ... + 10903634.

It is an arithmetic number, because the mean of its divisors is an integer number (811188780).

Almost surely, 2^12211443440 is an apocalyptic number.

12211443440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211443440 is an abundant number, since it is smaller than the sum of its proper divisors (20236107760).

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

12211443440 is a wasteful number, since it uses less digits than its factorization.

12211443440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21806169 (or 21806163 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 12211443440 its reverse (4434411221), we get a palindrome (16645854661).

The spelling of 12211443440 in words is "twelve billion, two hundred eleven million, four hundred forty-three thousand, four hundred forty".