55443421 has 8 divisors (see below), whose sum is σ = 61509600. Its totient is φ = 49548240.

The previous prime is 55443361. The next prime is 55443433. The reversal of 55443421 is 12434455.

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 55443421 - 2¹³ = 55435229 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 55443421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55443481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42066 + ... + 43363.

It is an arithmetic number, because the mean of its divisors is an integer number (7688700).

Almost surely, 2^55443421 is an apocalyptic number.

It is an amenable number.

55443421 is a deficient number, since it is larger than the sum of its proper divisors (6066179).

55443421 is a wasteful number, since it uses less digits than its factorization.

55443421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85499.

The product of its digits is 9600, while the sum is 28.

The square root of 55443421 is about 7446.0339107474. The cubic root of 55443421 is about 381.3145172190.

Adding to 55443421 its reverse (12434455), we get a palindrome (67877876).

It can be divided in two parts, 554434 and 21, that added together give a palindrome (554455).

The spelling of 55443421 in words is "fifty-five million, four hundred forty-three thousand, four hundred twenty-one".