55533421 has 4 divisors (see below), whose sum is σ = 55901344. Its totient is φ = 55165500.

The previous prime is 55533397. The next prime is 55533433. The reversal of 55533421 is 12433555.

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 a cyclic number.

It is not a de Polignac number, because 55533421 - 2¹¹ = 55531373 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 55533421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55533451) 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, 183735 + ... + 184036.

It is an arithmetic number, because the mean of its divisors is an integer number (13975336).

Almost surely, 2^55533421 is an apocalyptic number.

It is an amenable number.

55533421 is a deficient number, since it is larger than the sum of its proper divisors (367923).

55533421 is a wasteful number, since it uses less digits than its factorization.

55533421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367922.

The product of its digits is 9000, while the sum is 28.

The square root of 55533421 is about 7452.0749459463. The cubic root of 55533421 is about 381.5207319709.

Adding to 55533421 its reverse (12433555), we get a palindrome (67966976).

The spelling of 55533421 in words is "fifty-five million, five hundred thirty-three thousand, four hundred twenty-one".