55542421 has 8 divisors (see below), whose sum is σ = 62546688. Its totient is φ = 48864000.

The previous prime is 55542419. The next prime is 55542427. The reversal of 55542421 is 12424555.

55542421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55542421 - 2¹ = 55542419 is a prime.

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 55542421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55542427) 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 7 ways as a sum of consecutive naturals, for example, 81100 + ... + 81781.

It is an arithmetic number, because the mean of its divisors is an integer number (7818336).

Almost surely, 2^55542421 is an apocalyptic number.

It is an amenable number.

55542421 is a deficient number, since it is larger than the sum of its proper divisors (7004267).

55542421 is a wasteful number, since it uses less digits than its factorization.

55542421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162923.

The product of its digits is 8000, while the sum is 28.

The square root of 55542421 is about 7452.6787801434. The cubic root of 55542421 is about 381.5413411887.

Adding to 55542421 its reverse (12424555), we get a palindrome (67966976).

The spelling of 55542421 in words is "fifty-five million, five hundred forty-two thousand, four hundred twenty-one".