55421013003521 has 8 divisors (see below), whose sum is σ = 60459384083904. Its totient is φ = 50382658118320.

The previous prime is 55421013003511. The next prime is 55421013003563. The reversal of 55421013003521 is 12530031012455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55421013003521 - 2⁶ = 55421013003457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55421013003511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3761516 + ... + 11179938.

It is an arithmetic number, because the mean of its divisors is an integer number (7557423010488).

Almost surely, 2^{55421013003521} is an apocalyptic number.

It is an amenable number.

55421013003521 is a deficient number, since it is larger than the sum of its proper divisors (5038371080383).

55421013003521 is a wasteful number, since it uses less digits than its factorization.

55421013003521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8097591.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 55421013003521 its reverse (12530031012455), we get a palindrome (67951044015976).

The spelling of 55421013003521 in words is "fifty-five trillion, four hundred twenty-one billion, thirteen million, three thousand, five hundred twenty-one".