55021123 has 4 divisors (see below), whose sum is σ = 56300728. Its totient is φ = 53741520.

The previous prime is 55021117. The next prime is 55021151. The reversal of 55021123 is 32112055.

55021123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55021123 is a prime.

It is a super-2 number, since 2×55021123² = 6054647952362258, which contains 22 as substring.

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 55021123.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639738 + ... + 639823.

It is an arithmetic number, because the mean of its divisors is an integer number (14075182).

Almost surely, 2^55021123 is an apocalyptic number.

55021123 is a deficient number, since it is larger than the sum of its proper divisors (1279605).

55021123 is a wasteful number, since it uses less digits than its factorization.

55021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279604.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 55021123 is about 7417.6224627572. The cubic root of 55021123 is about 380.3439245509.

Adding to 55021123 its reverse (32112055), we get a palindrome (87133178).

The spelling of 55021123 in words is "fifty-five million, twenty-one thousand, one hundred twenty-three".