55253021 has 2 divisors, whose sum is σ = 55253022. Its totient is φ = 55253020.

The previous prime is 55252999. The next prime is 55253027. The reversal of 55253021 is 12035255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50608996 + 4644025 = 7114^2 + 2155^2 .

It is a cyclic number.

It is not a de Polignac number, because 55253021 - 2¹⁰ = 55251997 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 (55253027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27626510 + 27626511.

It is an arithmetic number, because the mean of its divisors is an integer number (27626511).

Almost surely, 2^55253021 is an apocalyptic number.

It is an amenable number.

55253021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55253021 is an equidigital number, since it uses as much as digits as its factorization.

55253021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 55253021 is about 7433.2375853325. The cubic root of 55253021 is about 380.8775218684.

Adding to 55253021 its reverse (12035255), we get a palindrome (67288276).

The spelling of 55253021 in words is "fifty-five million, two hundred fifty-three thousand, twenty-one".