55343221 has 4 divisors (see below), whose sum is σ = 57749472. Its totient is φ = 52936972.

The previous prime is 55343209. The next prime is 55343243. The reversal of 55343221 is 12234355.

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 55343221 - 2¹¹ = 55341173 is a prime.

It is a super-2 number, since 2×55343221² = 6125744221309682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55343261) 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, 1203091 + ... + 1203136.

It is an arithmetic number, because the mean of its divisors is an integer number (14437368).

Almost surely, 2^55343221 is an apocalyptic number.

It is an amenable number.

55343221 is a deficient number, since it is larger than the sum of its proper divisors (2406251).

55343221 is a wasteful number, since it uses less digits than its factorization.

55343221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406250.

The product of its digits is 3600, while the sum is 25.

The square root of 55343221 is about 7439.3024538595. The cubic root of 55343221 is about 381.0846687596.

Adding to 55343221 its reverse (12234355), we get a palindrome (67577576).

The spelling of 55343221 in words is "fifty-five million, three hundred forty-three thousand, two hundred twenty-one".