55203354515221 has 8 divisors (see below), whose sum is σ = 60225434036064. Its totient is φ = 50181873785520.

The previous prime is 55203354515203. The next prime is 55203354515249. The reversal of 55203354515221 is 12251545330255.

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

It is a cyclic number.

It is not a de Polignac number, because 55203354515221 - 2¹³ = 55203354507029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55203354515921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149505006 + ... + 149873791.

It is an arithmetic number, because the mean of its divisors is an integer number (7528179254508).

Almost surely, 2^{55203354515221} is an apocalyptic number.

It is an amenable number.

55203354515221 is a deficient number, since it is larger than the sum of its proper divisors (5022079520843).

55203354515221 is a wasteful number, since it uses less digits than its factorization.

55203354515221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299395571.

The product of its (nonzero) digits is 900000, while the sum is 43.

Adding to 55203354515221 its reverse (12251545330255), we get a palindrome (67454899845476).

The spelling of 55203354515221 in words is "fifty-five trillion, two hundred three billion, three hundred fifty-four million, five hundred fifteen thousand, two hundred twenty-one".