55021345320 has 64 divisors (see below), whose sum is σ = 173751624000. Its totient is φ = 13900128768.

The previous prime is 55021345289. The next prime is 55021345343. The reversal of 55021345320 is 2354312055.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12063805 + ... + 12068364.

It is an arithmetic number, because the mean of its divisors is an integer number (2714869125).

Almost surely, 2^55021345320 is an apocalyptic number.

It is an amenable number.

55021345320 is an abundant number, since it is smaller than the sum of its proper divisors (118730278680).

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

55021345320 is a wasteful number, since it uses less digits than its factorization.

55021345320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24132202 (or 24132198 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 55021345320 its reverse (2354312055), we get a palindrome (57375657375).

The spelling of 55021345320 in words is "fifty-five billion, twenty-one million, three hundred forty-five thousand, three hundred twenty".