55250821 has 8 divisors (see below), whose sum is σ = 56697984. Its totient is φ = 53808480.

The previous prime is 55250809. The next prime is 55250827. The reversal of 55250821 is 12805255.

55250821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55250821 - 2¹¹ = 55248773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55250821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55250827) 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 7 ways as a sum of consecutive naturals, for example, 38116 + ... + 39538.

It is an arithmetic number, because the mean of its divisors is an integer number (7087248).

Almost surely, 2^55250821 is an apocalyptic number.

It is an amenable number.

55250821 is a deficient number, since it is larger than the sum of its proper divisors (1447163).

55250821 is a wasteful number, since it uses less digits than its factorization.

55250821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 55250821 is about 7433.0895998905. The cubic root of 55250821 is about 380.8724666898.

The spelling of 55250821 in words is "fifty-five million, two hundred fifty thousand, eight hundred twenty-one".