55133323015221 has 12 divisors (see below), whose sum is σ = 86876751418080. Its totient is φ = 33414135160680.

The previous prime is 55133323015207. The next prime is 55133323015261. The reversal of 55133323015221 is 12251032333155.

55133323015221 is a `hidden beast` number, since 5 + 5 + 13 + 332 + 301 + 5 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 55133323015221 - 2⁵ = 55133323015189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55133323015261) 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 11 ways as a sum of consecutive naturals, for example, 278451126241 + ... + 278451126438.

It is an arithmetic number, because the mean of its divisors is an integer number (7239729284840).

Almost surely, 2^{55133323015221} is an apocalyptic number.

It is an amenable number.

55133323015221 is a deficient number, since it is larger than the sum of its proper divisors (31743428402859).

55133323015221 is a wasteful number, since it uses less digits than its factorization.

55133323015221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556902252696 (or 556902252693 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

Adding to 55133323015221 its reverse (12251032333155), we get a palindrome (67384355348376).

The spelling of 55133323015221 in words is "fifty-five trillion, one hundred thirty-three billion, three hundred twenty-three million, fifteen thousand, two hundred twenty-one".