55360421 has 2 divisors, whose sum is σ = 55360422. Its totient is φ = 55360420.

The previous prime is 55360411. The next prime is 55360427. The reversal of 55360421 is 12406355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46444225 + 8916196 = 6815^2 + 2986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55360421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55360427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27680210 + 27680211.

It is an arithmetic number, because the mean of its divisors is an integer number (27680211).

Almost surely, 2^55360421 is an apocalyptic number.

It is an amenable number.

55360421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55360421 is an equidigital number, since it uses as much as digits as its factorization.

55360421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 55360421 is about 7440.4583864168. The cubic root of 55360421 is about 381.1241434973.

Adding to 55360421 its reverse (12406355), we get a palindrome (67766776).

The spelling of 55360421 in words is "fifty-five million, three hundred sixty thousand, four hundred twenty-one".