55033921 has 4 divisors (see below), whose sum is σ = 55050372. Its totient is φ = 55017472.

The previous prime is 55033919. The next prime is 55033933. The reversal of 55033921 is 12933055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12933055 = 5 ⋅2586611.

It can be written as a sum of positive squares in 2 ways, for example, as 46991025 + 8042896 = 6855^2 + 2836^2 .

It is a cyclic number.

It is not a de Polignac number, because 55033921 - 2¹ = 55033919 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 55033921.

It is not an unprimeable number, because it can be changed into a prime (55034921) 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, 1216 + ... + 10561.

It is an arithmetic number, because the mean of its divisors is an integer number (13762593).

Almost surely, 2^55033921 is an apocalyptic number.

It is an amenable number.

55033921 is a deficient number, since it is larger than the sum of its proper divisors (16451).

55033921 is a wasteful number, since it uses less digits than its factorization.

55033921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16450.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 55033921 is about 7418.4850879408. The cubic root of 55033921 is about 380.3734117970.

Adding to 55033921 its reverse (12933055), we get a palindrome (67966976).

The spelling of 55033921 in words is "fifty-five million, thirty-three thousand, nine hundred twenty-one".