257074021 has 8 divisors (see below), whose sum is σ = 260321400. Its totient is φ = 253847232.

The previous prime is 257074001. The next prime is 257074043. The reversal of 257074021 is 120470752.

It can be written as a sum of positive squares in 4 ways, for example, as 10144225 + 246929796 = 3185^2 + 15714^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257074021 - 2⁵ = 257073989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257074001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20791 + ... + 30763.

It is an arithmetic number, because the mean of its divisors is an integer number (32540175).

Almost surely, 2^257074021 is an apocalyptic number.

It is an amenable number.

257074021 is a deficient number, since it is larger than the sum of its proper divisors (3247379).

257074021 is a wasteful number, since it uses less digits than its factorization.

257074021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10295.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 257074021 is about 16033.5280272309. The cubic root of 257074021 is about 635.8471517046.

The spelling of 257074021 in words is "two hundred fifty-seven million, seventy-four thousand, twenty-one".