55324421 has 4 divisors (see below), whose sum is σ = 56368332. Its totient is φ = 54280512.

The previous prime is 55324403. The next prime is 55324427. The reversal of 55324421 is 12442355.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12442355 = 5 ⋅2488471.

It can be written as a sum of positive squares in 2 ways, for example, as 19492225 + 35832196 = 4415^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 55324421 - 2¹⁴ = 55308037 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 (55324427) 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, 521876 + ... + 521981.

It is an arithmetic number, because the mean of its divisors is an integer number (14092083).

Almost surely, 2^55324421 is an apocalyptic number.

It is an amenable number.

55324421 is a deficient number, since it is larger than the sum of its proper divisors (1043911).

55324421 is a wasteful number, since it uses less digits than its factorization.

55324421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043910.

The product of its digits is 4800, while the sum is 26.

The square root of 55324421 is about 7438.0387872073. The cubic root of 55324421 is about 381.0415125968.

Adding to 55324421 its reverse (12442355), we get a palindrome (67766776).

The spelling of 55324421 in words is "fifty-five million, three hundred twenty-four thousand, four hundred twenty-one".