55404527420221 has 24 divisors (see below), whose sum is σ = 67855584089760. Its totient is φ = 44981318844000.

The previous prime is 55404527420173. The next prime is 55404527420243. The reversal of 55404527420221 is 12202472540455.

It is not a de Polignac number, because 55404527420221 - 2¹⁹ = 55404526895933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55404527430221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1084215 + ... + 10582276.

It is an arithmetic number, because the mean of its divisors is an integer number (2827316003740).

Almost surely, 2^{55404527420221} is an apocalyptic number.

It is an amenable number.

55404527420221 is a deficient number, since it is larger than the sum of its proper divisors (12451056669539).

55404527420221 is a wasteful number, since it uses less digits than its factorization.

55404527420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11671625 (or 11671618 counting only the distinct ones).

The product of its (nonzero) digits is 896000, while the sum is 43.

Adding to 55404527420221 its reverse (12202472540455), we get a palindrome (67606999960676).

The spelling of 55404527420221 in words is "fifty-five trillion, four hundred four billion, five hundred twenty-seven million, four hundred twenty thousand, two hundred twenty-one".