55221324240 has 80 divisors (see below), whose sum is σ = 176708261376. Its totient is φ = 14250662400.

The previous prime is 55221324233. The next prime is 55221324269. The reversal of 55221324240 is 4242312255.

55221324240 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 (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55221324198 and 55221324207.

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, 3703671 + ... + 3718550.

Almost surely, 2^55221324240 is an apocalyptic number.

It is an amenable number.

55221324240 is an abundant number, since it is smaller than the sum of its proper divisors (121486937136).

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

55221324240 is a wasteful number, since it uses less digits than its factorization.

55221324240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7422268 (or 7422262 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 55221324240 its reverse (4242312255), we get a palindrome (59463636495).

The spelling of 55221324240 in words is "fifty-five billion, two hundred twenty-one million, three hundred twenty-four thousand, two hundred forty".