55055421 has 6 divisors (see below), whose sum is σ = 79524510. Its totient is φ = 36703608.

The previous prime is 55055419. The next prime is 55055431. The reversal of 55055421 is 12455055.

It can be written as a sum of positive squares in only one way, i.e., 30404196 + 24651225 = 5514^2 + 4965^2 .

It is not a de Polignac number, because 55055421 - 2¹ = 55055419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55055431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3058626 + ... + 3058643.

It is an arithmetic number, because the mean of its divisors is an integer number (13254085).

Almost surely, 2^55055421 is an apocalyptic number.

It is an amenable number.

55055421 is a deficient number, since it is larger than the sum of its proper divisors (24469089).

55055421 is a wasteful number, since it uses less digits than its factorization.

55055421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6117275 (or 6117272 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 55055421 is about 7419.9340293563. The cubic root of 55055421 is about 380.4229386069.

The spelling of 55055421 in words is "fifty-five million, fifty-five thousand, four hundred twenty-one".