55033021 has 8 divisors (see below), whose sum is σ = 56093184. Its totient is φ = 53981280.

The previous prime is 55032983. The next prime is 55033049. The reversal of 55033021 is 12033055.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55033021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55033021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55033081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11970 + ... + 15916.

It is an arithmetic number, because the mean of its divisors is an integer number (7011648).

Almost surely, 2^55033021 is an apocalyptic number.

It is an amenable number.

55033021 is a deficient number, since it is larger than the sum of its proper divisors (1060163).

55033021 is a wasteful number, since it uses less digits than its factorization.

55033021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 55033021 is about 7418.4244284080. The cubic root of 55033021 is about 380.3713383005.

Adding to 55033021 its reverse (12033055), we get a palindrome (67066076).

The spelling of 55033021 in words is "fifty-five million, thirty-three thousand, twenty-one".