55133421 has 16 divisors (see below), whose sum is σ = 88435200. Its totient is φ = 29846448.

The previous prime is 55133413. The next prime is 55133423. The reversal of 55133421 is 12433155.

55133421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55133421 - 2³ = 55133413 is a prime.

It is a super-2 number, since 2×55133421² = 6079388222326482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55133391 and 55133400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55133423) 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 15 ways as a sum of consecutive naturals, for example, 68691 + ... + 69488.

It is an arithmetic number, because the mean of its divisors is an integer number (5527200).

Almost surely, 2^55133421 is an apocalyptic number.

It is an amenable number.

55133421 is a deficient number, since it is larger than the sum of its proper divisors (33301779).

55133421 is a wasteful number, since it uses less digits than its factorization.

55133421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138208.

The product of its digits is 1800, while the sum is 24.

The square root of 55133421 is about 7425.1882804411. The cubic root of 55133421 is about 380.6025090989.

Adding to 55133421 its reverse (12433155), we get a palindrome (67566576).

The spelling of 55133421 in words is "fifty-five million, one hundred thirty-three thousand, four hundred twenty-one".