55421143440 has 240 divisors, whose sum is σ = 187290691200. Its totient is φ = 13550284800.

The previous prime is 55421143433. The next prime is 55421143441. The reversal of 55421143440 is 4434112455.

It is a happy number.

55421143440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is not an unprimeable number, because it can be changed into a prime (55421143441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6120036 + ... + 6129084.

It is an arithmetic number, because the mean of its divisors is an integer number (780377880).

Almost surely, 2^55421143440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55421143440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93645345600).

55421143440 is an abundant number, since it is smaller than the sum of its proper divisors (131869547760).

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

55421143440 is a wasteful number, since it uses less digits than its factorization.

55421143440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9242 (or 9223 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 55421143440 its reverse (4434112455), we get a palindrome (59855255895).

The spelling of 55421143440 in words is "fifty-five billion, four hundred twenty-one million, one hundred forty-three thousand, four hundred forty".