55332421 has 4 divisors (see below), whose sum is σ = 55348000. Its totient is φ = 55316844.

The previous prime is 55332413. The next prime is 55332449. The reversal of 55332421 is 12423355.

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 55332421 - 2³ = 55332413 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 (55332461) 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, 430 + ... + 10528.

It is an arithmetic number, because the mean of its divisors is an integer number (13837000).

Almost surely, 2^55332421 is an apocalyptic number.

It is an amenable number.

55332421 is a deficient number, since it is larger than the sum of its proper divisors (15579).

55332421 is a wasteful number, since it uses less digits than its factorization.

55332421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15578.

The product of its digits is 3600, while the sum is 25.

The square root of 55332421 is about 7438.5765439363. The cubic root of 55332421 is about 381.0598781162.

Adding to 55332421 its reverse (12423355), we get a palindrome (67755776).

The spelling of 55332421 in words is "fifty-five million, three hundred thirty-two thousand, four hundred twenty-one".