55300021 has 16 divisors (see below), whose sum is σ = 66261888. Its totient is φ = 45158400.

The previous prime is 55299973. The next prime is 55300033. The reversal of 55300021 is 12000355.

It is not a de Polignac number, because 55300021 - 2¹¹ = 55297973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55299968 and 55300004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55300121) 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 15 ways as a sum of consecutive naturals, for example, 10101 + ... + 14581.

It is an arithmetic number, because the mean of its divisors is an integer number (4141368).

Almost surely, 2^55300021 is an apocalyptic number.

It is an amenable number.

55300021 is a deficient number, since it is larger than the sum of its proper divisors (10961867).

55300021 is a wasteful number, since it uses less digits than its factorization.

55300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4572.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 55300021 is about 7436.3983890053. The cubic root of 55300021 is about 380.9854868255.

Adding to 55300021 its reverse (12000355), we get a palindrome (67300376).

The spelling of 55300021 in words is "fifty-five million, three hundred thousand, twenty-one".