55333321 has 4 divisors (see below), whose sum is σ = 55349892. Its totient is φ = 55316752.

The previous prime is 55333307. The next prime is 55333337. The reversal of 55333321 is 12333355.

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 30969225 + 24364096 = 5565^2 + 4936^2 .

It is a cyclic number.

It is not a de Polignac number, because 55333321 - 2¹⁹ = 54809033 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55339321) 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, 1330 + ... + 10603.

It is an arithmetic number, because the mean of its divisors is an integer number (13837473).

Almost surely, 2^55333321 is an apocalyptic number.

It is an amenable number.

55333321 is a deficient number, since it is larger than the sum of its proper divisors (16571).

55333321 is a wasteful number, since it uses less digits than its factorization.

55333321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16570.

The product of its digits is 4050, while the sum is 25.

The square root of 55333321 is about 7438.6370391356. The cubic root of 55333321 is about 381.0619441264.

Adding to 55333321 its reverse (12333355), we get a palindrome (67666676).

The spelling of 55333321 in words is "fifty-five million, three hundred thirty-three thousand, three hundred twenty-one".