55332821 has 8 divisors (see below), whose sum is σ = 57531264. Its totient is φ = 53174880.

The previous prime is 55332817. The next prime is 55332847. The reversal of 55332821 is 12823355.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55332821 - 2² = 55332817 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 (55332811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7325 + ... + 12818.

It is an arithmetic number, because the mean of its divisors is an integer number (7191408).

Almost surely, 2^55332821 is an apocalyptic number.

It is an amenable number.

55332821 is a deficient number, since it is larger than the sum of its proper divisors (2198443).

55332821 is a wasteful number, since it uses less digits than its factorization.

55332821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20251.

The product of its digits is 7200, while the sum is 29.

The square root of 55332821 is about 7438.6034307523. The cubic root of 55332821 is about 381.0607963457.

The spelling of 55332821 in words is "fifty-five million, three hundred thirty-two thousand, eight hundred twenty-one".