55333421 has 24 divisors (see below), whose sum is σ = 67814040. Its totient is φ = 44795520.

The previous prime is 55333379. The next prime is 55333433. The reversal of 55333421 is 12433355.

It can be written as a sum of positive squares in 4 ways, for example, as 366025 + 54967396 = 605^2 + 7414^2 .

It is not a de Polignac number, because 55333421 - 2¹⁸ = 55071277 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55333441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45011 + ... + 46223.

It is an arithmetic number, because the mean of its divisors is an integer number (2825585).

Almost surely, 2^55333421 is an apocalyptic number.

It is an amenable number.

55333421 is a deficient number, since it is larger than the sum of its proper divisors (12480619).

55333421 is a wasteful number, since it uses less digits than its factorization.

55333421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277 (or 1266 counting only the distinct ones).

The product of its digits is 5400, while the sum is 26.

The square root of 55333421 is about 7438.6437607940. The cubic root of 55333421 is about 381.0621736817.

Adding to 55333421 its reverse (12433355), we get a palindrome (67766776).

It can be divided in two parts, 553334 and 21, that added together give a palindrome (553355).

The spelling of 55333421 in words is "fifty-five million, three hundred thirty-three thousand, four hundred twenty-one".