55021404 has 48 divisors (see below), whose sum is σ = 133217280. Its totient is φ = 17656320.

The previous prime is 55021403. The next prime is 55021423. The reversal of 55021404 is 40412055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55021403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131107 + ... + 131525.

It is an arithmetic number, because the mean of its divisors is an integer number (2775360).

Almost surely, 2^55021404 is an apocalyptic number.

It is an amenable number.

55021404 is an abundant number, since it is smaller than the sum of its proper divisors (78195876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55021404 is a wasteful number, since it uses less digits than its factorization.

55021404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 55021404 is about 7417.6414041122. The cubic root of 55021404 is about 380.3445720384.

Adding to 55021404 its reverse (40412055), we get a palindrome (95433459).

The spelling of 55021404 in words is "fifty-five million, twenty-one thousand, four hundred four".