11220143440 has 80 divisors (see below), whose sum is σ = 29227593600. Its totient is φ = 3969768960.

The previous prime is 11220143423. The next prime is 11220143449. The reversal of 11220143440 is 4434102211.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220143449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139740 + ... + 204859.

It is an arithmetic number, because the mean of its divisors is an integer number (365344920).

Almost surely, 2^11220143440 is an apocalyptic number.

11220143440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11220143440 is an abundant number, since it is smaller than the sum of its proper divisors (18007450160).

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

11220143440 is a wasteful number, since it uses less digits than its factorization.

11220143440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344660 (or 344654 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 11220143440 its reverse (4434102211), we get a palindrome (15654245651).

The spelling of 11220143440 in words is "eleven billion, two hundred twenty million, one hundred forty-three thousand, four hundred forty".