55065421 has 2 divisors, whose sum is σ = 55065422. Its totient is φ = 55065420.

The previous prime is 55065407. The next prime is 55065443. The reversal of 55065421 is 12456055.

55065421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35164900 + 19900521 = 5930^2 + 4461^2 .

It is a cyclic number.

It is not a de Polignac number, because 55065421 - 2¹³ = 55057229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55065421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55065481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27532710 + 27532711.

It is an arithmetic number, because the mean of its divisors is an integer number (27532711).

Almost surely, 2^55065421 is an apocalyptic number.

It is an amenable number.

55065421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55065421 is an equidigital number, since it uses as much as digits as its factorization.

55065421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 55065421 is about 7420.6078591986. The cubic root of 55065421 is about 380.4459699391.

The spelling of 55065421 in words is "fifty-five million, sixty-five thousand, four hundred twenty-one".