55421013003520 has 108 divisors (see below), whose sum is σ = 134761584526884. Its totient is φ = 21837531217920.

The previous prime is 55421013003511. The next prime is 55421013003563. The reversal of 55421013003520 is 2530031012455.

It can be written as a sum of positive squares in 2 ways, for example, as 8365144769536 + 47055868233984 = 2892256^2 + 6859728^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 923280 + ... + 10568560.

It is an arithmetic number, because the mean of its divisors is an integer number (1247792449323).

Almost surely, 2^{55421013003520} 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 55421013003520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67380792263442).

55421013003520 is an abundant number, since it is smaller than the sum of its proper divisors (79340571523364).

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

55421013003520 is an frugal number, since it uses more digits than its factorization.

55421013003520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9645436 (or 9645355 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 55421013003520 its reverse (2530031012455), we get a palindrome (57951044015975).

The spelling of 55421013003520 in words is "fifty-five trillion, four hundred twenty-one billion, thirteen million, three thousand, five hundred twenty".