55043505221 has 4 divisors (see below), whose sum is σ = 55045369344. Its totient is φ = 55041641100.

The previous prime is 55043505203. The next prime is 55043505241. The reversal of 55043505221 is 12250534055.

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 55043505221 - 2¹⁴ = 55043488837 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 (55043505241) 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 3 ways as a sum of consecutive naturals, for example, 887045 + ... + 947066.

It is an arithmetic number, because the mean of its divisors is an integer number (13761342336).

Almost surely, 2^55043505221 is an apocalyptic number.

It is an amenable number.

55043505221 is a deficient number, since it is larger than the sum of its proper divisors (1864123).

55043505221 is a wasteful number, since it uses less digits than its factorization.

55043505221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864122.

The product of its (nonzero) digits is 30000, while the sum is 32.

The spelling of 55043505221 in words is "fifty-five billion, forty-three million, five hundred five thousand, two hundred twenty-one".