255455021 has 2 divisors, whose sum is σ = 255455022. Its totient is φ = 255455020.

The previous prime is 255455003. The next prime is 255455023. The reversal of 255455021 is 120554552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234396100 + 21058921 = 15310^2 + 4589^2 .

It is a cyclic number.

It is not a de Polignac number, because 255455021 - 2¹⁴ = 255438637 is a prime.

It is a super-2 number, since 2×255455021² = 130514535508220882, which contains 22 as substring.

Together with 255455023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255455023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127727510 + 127727511.

It is an arithmetic number, because the mean of its divisors is an integer number (127727511).

Almost surely, 2^255455021 is an apocalyptic number.

It is an amenable number.

255455021 is a deficient number, since it is larger than the sum of its proper divisors (1).

255455021 is an equidigital number, since it uses as much as digits as its factorization.

255455021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 255455021 is about 15982.9603328044. The cubic root of 255455021 is about 634.5095276378.

It can be divided in two parts, 2554 and 55021, that added together give a palindrome (57575).

The spelling of 255455021 in words is "two hundred fifty-five million, four hundred fifty-five thousand, twenty-one".