55553321 has 4 divisors (see below), whose sum is σ = 58477200. Its totient is φ = 52629444.

The previous prime is 55553269. The next prime is 55553327. The reversal of 55553321 is 12335555.

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 55553321 - 2¹⁴ = 55536937 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 (55553327) 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, 1461911 + ... + 1461948.

It is an arithmetic number, because the mean of its divisors is an integer number (14619300).

Almost surely, 2^55553321 is an apocalyptic number.

It is an amenable number.

55553321 is a deficient number, since it is larger than the sum of its proper divisors (2923879).

55553321 is a wasteful number, since it uses less digits than its factorization.

55553321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923878.

The product of its digits is 11250, while the sum is 29.

The square root of 55553321 is about 7453.4100249483. The cubic root of 55553321 is about 381.5662982607.

Adding to 55553321 its reverse (12335555), we get a palindrome (67888876).

The spelling of 55553321 in words is "fifty-five million, five hundred fifty-three thousand, three hundred twenty-one".