255250021 has 16 divisors (see below), whose sum is σ = 293521536. Its totient is φ = 220118976.

The previous prime is 255250007. The next prime is 255250031. The reversal of 255250021 is 120052552.

It is a cyclic number.

It is not a de Polignac number, because 255250021 - 2⁷ = 255249893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255249974 and 255250001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255250031) 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 in 15 ways as a sum of consecutive naturals, for example, 2931 + ... + 22783.

It is an arithmetic number, because the mean of its divisors is an integer number (18345096).

Almost surely, 2^255250021 is an apocalyptic number.

It is an amenable number.

255250021 is a deficient number, since it is larger than the sum of its proper divisors (38271515).

255250021 is a wasteful number, since it uses less digits than its factorization.

255250021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19932.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 255250021 is about 15976.5459658839. The cubic root of 255250021 is about 634.3397531146.

The spelling of 255250021 in words is "two hundred fifty-five million, two hundred fifty thousand, twenty-one".