55103421 has 4 divisors (see below), whose sum is σ = 73471232. Its totient is φ = 36735612.

The previous prime is 55103381. The next prime is 55103431. The reversal of 55103421 is 12430155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55103421 - 2⁶ = 55103357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55103431) 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, 9183901 + ... + 9183906.

It is an arithmetic number, because the mean of its divisors is an integer number (18367808).

Almost surely, 2^55103421 is an apocalyptic number.

It is an amenable number.

55103421 is a deficient number, since it is larger than the sum of its proper divisors (18367811).

55103421 is a wasteful number, since it uses less digits than its factorization.

55103421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18367810.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 55103421 is about 7423.1678547639. The cubic root of 55103421 is about 380.5334635806.

Adding to 55103421 its reverse (12430155), we get a palindrome (67533576).

The spelling of 55103421 in words is "fifty-five million, one hundred three thousand, four hundred twenty-one".