55204221421201 has 4 divisors (see below), whose sum is σ = 55204532746804. Its totient is φ = 55203910095600.

The previous prime is 55204221421171. The next prime is 55204221421211. The reversal of 55204221421201 is 10212412240255.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24569667968400 + 30634553452801 = 4956780^2 + 5534849^2 .

It is a cyclic number.

It is not a de Polignac number, because 55204221421201 - 2³¹ = 55202073937553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55204221421211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155396670 + ... + 155751511.

It is an arithmetic number, because the mean of its divisors is an integer number (13801133186701).

Almost surely, 2^{55204221421201} is an apocalyptic number.

It is an amenable number.

55204221421201 is a deficient number, since it is larger than the sum of its proper divisors (311325603).

55204221421201 is a wasteful number, since it uses less digits than its factorization.

55204221421201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311325602.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 55204221421201 its reverse (10212412240255), we get a palindrome (65416633661456).

The spelling of 55204221421201 in words is "fifty-five trillion, two hundred four billion, two hundred twenty-one million, four hundred twenty-one thousand, two hundred one".