55021424 has 20 divisors (see below), whose sum is σ = 109084536. Its totient is φ = 26870592.

The previous prime is 55021423. The next prime is 55021471. The reversal of 55021424 is 42412055.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 55021424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55021423) 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, 39299 + ... + 40674.

Almost surely, 2^55021424 is an apocalyptic number.

It is an amenable number.

55021424 is a deficient number, since it is larger than the sum of its proper divisors (54063112).

55021424 is a wasteful number, since it uses less digits than its factorization.

55021424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80024 (or 80018 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 55021424 is about 7417.6427522495. The cubic root of 55021424 is about 380.3446181228.

Adding to 55021424 its reverse (42412055), we get a palindrome (97433479).

The spelling of 55021424 in words is "fifty-five million, twenty-one thousand, four hundred twenty-four".