55021143 has 12 divisors (see below), whose sum is σ = 73943160. Its totient is φ = 36391536.

The previous prime is 55021117. The next prime is 55021151. The reversal of 55021143 is 34112055.

It is not a de Polignac number, because 55021143 - 2⁵ = 55021111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55021103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194280 + ... + 194562.

It is an arithmetic number, because the mean of its divisors is an integer number (6161930).

Almost surely, 2^55021143 is an apocalyptic number.

55021143 is a deficient number, since it is larger than the sum of its proper divisors (18922017).

55021143 is an equidigital number, since it uses as much as digits as its factorization.

55021143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 55021143 is about 7417.6238108979. The cubic root of 55021143 is about 380.3439706355.

Adding to 55021143 its reverse (34112055), we get a palindrome (89133198).

The spelling of 55021143 in words is "fifty-five million, twenty-one thousand, one hundred forty-three".