55044421 has 4 divisors (see below), whose sum is σ = 55134252. Its totient is φ = 54954592.

The previous prime is 55044413. The next prime is 55044433. The reversal of 55044421 is 12444055.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21520321 + 33524100 = 4639^2 + 5790^2 .

It is a cyclic number.

It is not a de Polignac number, because 55044421 - 2³ = 55044413 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 (55044401) 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, 43990 + ... + 45223.

It is an arithmetic number, because the mean of its divisors is an integer number (13783563).

Almost surely, 2^55044421 is an apocalyptic number.

It is an amenable number.

55044421 is a deficient number, since it is larger than the sum of its proper divisors (89831).

55044421 is an equidigital number, since it uses as much as digits as its factorization.

55044421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89830.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 55044421 is about 7419.1927458451. The cubic root of 55044421 is about 380.3976009200.

Adding to 55044421 its reverse (12444055), we get a palindrome (67488476).

The spelling of 55044421 in words is "fifty-five million, forty-four thousand, four hundred twenty-one".