22143203440 has 80 divisors (see below), whose sum is σ = 54280811520. Its totient is φ = 8377447680.

The previous prime is 22143203437. The next prime is 22143203473. The reversal of 22143203440 is 4430234122.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947577 + ... + 970663.

It is an arithmetic number, because the mean of its divisors is an integer number (678510144).

Almost surely, 2^22143203440 is an apocalyptic number.

22143203440 is a gapful number since it is divisible by the number (20) 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 22143203440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27140405760).

22143203440 is an abundant number, since it is smaller than the sum of its proper divisors (32137608080).

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

22143203440 is a wasteful number, since it uses less digits than its factorization.

22143203440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23750 (or 23744 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 22143203440 its reverse (4430234122), we get a palindrome (26573437562).

The spelling of 22143203440 in words is "twenty-two billion, one hundred forty-three million, two hundred three thousand, four hundred forty".