55426321 has 12 divisors (see below), whose sum is σ = 57344112. Its totient is φ = 53560104.

The previous prime is 55426313. The next prime is 55426339. The reversal of 55426321 is 12362455.

It is not a de Polignac number, because 55426321 - 2³ = 55426313 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 55426321.

It is not an unprimeable number, because it can be changed into a prime (55426351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 517950 + ... + 518056.

It is an arithmetic number, because the mean of its divisors is an integer number (4778676).

Almost surely, 2^55426321 is an apocalyptic number.

It is an amenable number.

55426321 is a deficient number, since it is larger than the sum of its proper divisors (1917791).

55426321 is an equidigital number, since it uses as much as digits as its factorization.

55426321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 269 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 55426321 is about 7444.8855598995. The cubic root of 55426321 is about 381.2753111924.

Adding to 55426321 its reverse (12362455), we get a palindrome (67788776).

The spelling of 55426321 in words is "fifty-five million, four hundred twenty-six thousand, three hundred twenty-one".