55365421 has 2 divisors, whose sum is σ = 55365422. Its totient is φ = 55365420.

The previous prime is 55365397. The next prime is 55365433. The reversal of 55365421 is 12456355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 1929321 = 7310^2 + 1389^2 .

It is a cyclic number.

It is not a de Polignac number, because 55365421 - 2⁹ = 55364909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55365451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27682710 + 27682711.

It is an arithmetic number, because the mean of its divisors is an integer number (27682711).

Almost surely, 2^55365421 is an apocalyptic number.

It is an amenable number.

55365421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55365421 is an equidigital number, since it uses as much as digits as its factorization.

55365421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 31.

The square root of 55365421 is about 7440.7943796345. The cubic root of 55365421 is about 381.1356171778.

The spelling of 55365421 in words is "fifty-five million, three hundred sixty-five thousand, four hundred twenty-one".