55554421 has 4 divisors (see below), whose sum is σ = 59827852. Its totient is φ = 51280992.

The previous prime is 55554383. The next prime is 55554479. The reversal of 55554421 is 12445555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12445555 = 5 ⋅2489111.

It can be written as a sum of positive squares in 2 ways, for example, as 30404196 + 25150225 = 5514^2 + 5015^2 .

It is a cyclic number.

It is not a de Polignac number, because 55554421 - 2¹¹ = 55552373 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55554481) 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, 2136696 + ... + 2136721.

It is an arithmetic number, because the mean of its divisors is an integer number (14956963).

Almost surely, 2^55554421 is an apocalyptic number.

It is an amenable number.

55554421 is a deficient number, since it is larger than the sum of its proper divisors (4273431).

55554421 is a wasteful number, since it uses less digits than its factorization.

55554421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4273430.

The product of its digits is 20000, while the sum is 31.

The square root of 55554421 is about 7453.4838163103. The cubic root of 55554421 is about 381.5688166830.

Adding to 55554421 its reverse (12445555), we get a palindrome (67999976).

The spelling of 55554421 in words is "fifty-five million, five hundred fifty-four thousand, four hundred twenty-one".