55350021 has 8 divisors (see below), whose sum is σ = 77684320. Its totient is φ = 34957872.

The previous prime is 55350019. The next prime is 55350023. The reversal of 55350021 is 12005355.

It is an interprime number because it is at equal distance from previous prime (55350019) and next prime (55350023).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55350021 - 2¹ = 55350019 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 55350021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55350023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485470 + ... + 485583.

It is an arithmetic number, because the mean of its divisors is an integer number (9710540).

Almost surely, 2^55350021 is an apocalyptic number.

It is an amenable number.

55350021 is a deficient number, since it is larger than the sum of its proper divisors (22334299).

55350021 is a wasteful number, since it uses less digits than its factorization.

55350021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971075.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 55350021 is about 7439.7594719184. The cubic root of 55350021 is about 381.1002760287.

Adding to 55350021 its reverse (12005355), we get a palindrome (67355376).

The spelling of 55350021 in words is "fifty-five million, three hundred fifty thousand, twenty-one".