255042421 has 2 divisors, whose sum is σ = 255042422. Its totient is φ = 255042420.

The previous prime is 255042419. The next prime is 255042433. The reversal of 255042421 is 124240552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255040900 + 1521 = 15970^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 255042421 - 2¹ = 255042419 is a prime.

Together with 255042419, it forms a pair of twin primes.

It is equal to p_13940026 and since 255042421 and 13940026 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255042481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127521210 + 127521211.

It is an arithmetic number, because the mean of its divisors is an integer number (127521211).

Almost surely, 2^255042421 is an apocalyptic number.

It is an amenable number.

255042421 is a deficient number, since it is larger than the sum of its proper divisors (1).

255042421 is an equidigital number, since it uses as much as digits as its factorization.

255042421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 255042421 is about 15970.0476204675. The cubic root of 255042421 is about 634.1677326904.

Adding to 255042421 its reverse (124240552), we get a palindrome (379282973).

The spelling of 255042421 in words is "two hundred fifty-five million, forty-two thousand, four hundred twenty-one".