55421445520220 has 96 divisors (see below), whose sum is σ = 126313706534400. Its totient is φ = 20304007476480.

The previous prime is 55421445520213. The next prime is 55421445520223. The reversal of 55421445520220 is 2202554412455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55421445520223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230227481 + ... + 230468079.

It is an arithmetic number, because the mean of its divisors is an integer number (1315767776400).

Almost surely, 2^{55421445520220} 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 55421445520220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63156853267200).

55421445520220 is an abundant number, since it is smaller than the sum of its proper divisors (70892261014180).

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

55421445520220 is a wasteful number, since it uses less digits than its factorization.

55421445520220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247515 (or 247513 counting only the distinct ones).

The product of its (nonzero) digits is 640000, while the sum is 41.

Adding to 55421445520220 its reverse (2202554412455), we get a palindrome (57623999932675).

The spelling of 55421445520220 in words is "fifty-five trillion, four hundred twenty-one billion, four hundred forty-five million, five hundred twenty thousand, two hundred twenty".