55580421 has 8 divisors (see below), whose sum is σ = 79807840. Its totient is φ = 34203312.

The previous prime is 55580387. The next prime is 55580423. The reversal of 55580421 is 12408555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55580421 - 2¹⁷ = 55449349 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 (55580423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712531 + ... + 712608.

It is an arithmetic number, because the mean of its divisors is an integer number (9975980).

Almost surely, 2^55580421 is an apocalyptic number.

It is an amenable number.

55580421 is a deficient number, since it is larger than the sum of its proper divisors (24227419).

55580421 is a wasteful number, since it uses less digits than its factorization.

55580421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425155.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 55580421 is about 7455.2277631203. The cubic root of 55580421 is about 381.6283333502.

Adding to 55580421 its reverse (12408555), we get a palindrome (67988976).

The spelling of 55580421 in words is "fifty-five million, five hundred eighty thousand, four hundred twenty-one".