55086421 has 4 divisors (see below), whose sum is σ = 59323852. Its totient is φ = 50848992.

The previous prime is 55086419. The next prime is 55086431. The reversal of 55086421 is 12468055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10048900 + 45037521 = 3170^2 + 6711^2 .

It is a cyclic number.

It is not a de Polignac number, because 55086421 - 2¹ = 55086419 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 (55086401) 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, 2118696 + ... + 2118721.

It is an arithmetic number, because the mean of its divisors is an integer number (14830963).

Almost surely, 2^55086421 is an apocalyptic number.

It is an amenable number.

55086421 is a deficient number, since it is larger than the sum of its proper divisors (4237431).

55086421 is a wasteful number, since it uses less digits than its factorization.

55086421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4237430.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 55086421 is about 7422.0227027408. The cubic root of 55086421 is about 380.4943266623.

The spelling of 55086421 in words is "fifty-five million, eighty-six thousand, four hundred twenty-one".