55305421 has 4 divisors (see below), whose sum is σ = 55567744. Its totient is φ = 55043100.

The previous prime is 55305413. The next prime is 55305427. The reversal of 55305421 is 12450355.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55305421 - 2³ = 55305413 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 (55305427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130845 + ... + 131266.

It is an arithmetic number, because the mean of its divisors is an integer number (13891936).

Almost surely, 2^55305421 is an apocalyptic number.

It is an amenable number.

55305421 is a deficient number, since it is larger than the sum of its proper divisors (262323).

55305421 is a wasteful number, since it uses less digits than its factorization.

55305421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262322.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 55305421 is about 7436.7614591299. The cubic root of 55305421 is about 380.9978873915.

Adding to 55305421 its reverse (12450355), we get a palindrome (67755776).

The spelling of 55305421 in words is "fifty-five million, three hundred five thousand, four hundred twenty-one".