55021220442321 has 32 divisors (see below), whose sum is σ = 84365907913728. Its totient is φ = 31244744856000.

The previous prime is 55021220442317. The next prime is 55021220442323. The reversal of 55021220442321 is 12324402212055.

It is not a de Polignac number, because 55021220442321 - 2² = 55021220442317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55021220442323) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 9446526 + ... + 14116631.

It is an arithmetic number, because the mean of its divisors is an integer number (2636434622304).

Almost surely, 2^{55021220442321} is an apocalyptic number.

It is an amenable number.

55021220442321 is a deficient number, since it is larger than the sum of its proper divisors (29344687471407).

55021220442321 is a wasteful number, since it uses less digits than its factorization.

55021220442321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23563861.

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

Adding to 55021220442321 its reverse (12324402212055), we get a palindrome (67345622654376).

The spelling of 55021220442321 in words is "fifty-five trillion, twenty-one billion, two hundred twenty million, four hundred forty-two thousand, three hundred twenty-one".