255106021 has 2 divisors, whose sum is σ = 255106022. Its totient is φ = 255106020.

The previous prime is 255106001. The next prime is 255106073. The reversal of 255106021 is 120601552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176517796 + 78588225 = 13286^2 + 8865^2 .

It is a cyclic number.

It is not a de Polignac number, because 255106021 - 2¹¹ = 255103973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255105983 and 255106001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255106001) 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, 127553010 + 127553011.

It is an arithmetic number, because the mean of its divisors is an integer number (127553011).

Almost surely, 2^255106021 is an apocalyptic number.

It is an amenable number.

255106021 is a deficient number, since it is larger than the sum of its proper divisors (1).

255106021 is an equidigital number, since it uses as much as digits as its factorization.

255106021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 255106021 is about 15972.0387239701. The cubic root of 255106021 is about 634.2204425043.

Adding to 255106021 its reverse (120601552), we get a palindrome (375707573).

It can be divided in two parts, 255 and 106021, that added together give a square (106276 = 326²).

The spelling of 255106021 in words is "two hundred fifty-five million, one hundred six thousand, twenty-one".