55325021 has 16 divisors (see below), whose sum is σ = 60073200. Its totient is φ = 50761728.

The previous prime is 55325009. The next prime is 55325033. The reversal of 55325021 is 12052355.

55325021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55325009) and next prime (55325033).

It can be written as a sum of positive squares in 8 ways, for example, as 13980121 + 41344900 = 3739^2 + 6430^2 .

It is not a de Polignac number, because 55325021 - 2⁶ = 55324957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55325521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135065 + ... + 135473.

It is an arithmetic number, because the mean of its divisors is an integer number (3754575).

Almost surely, 2^55325021 is an apocalyptic number.

It is an amenable number.

55325021 is a deficient number, since it is larger than the sum of its proper divisors (4748179).

55325021 is a wasteful number, since it uses less digits than its factorization.

55325021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 55325021 is about 7438.0791203106. The cubic root of 55325021 is about 381.0428900722.

Adding to 55325021 its reverse (12052355), we get a palindrome (67377376).

The spelling of 55325021 in words is "fifty-five million, three hundred twenty-five thousand, twenty-one".