257081421 has 8 divisors (see below), whose sum is σ = 342859680. Its totient is φ = 171345392.

The previous prime is 257081393. The next prime is 257081437. The reversal of 257081421 is 124180752.

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 257081421 - 2⁹ = 257080909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257081621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8635 + ... + 24263.

It is an arithmetic number, because the mean of its divisors is an integer number (42857460).

Almost surely, 2^257081421 is an apocalyptic number.

It is an amenable number.

257081421 is a deficient number, since it is larger than the sum of its proper divisors (85778259).

257081421 is a wasteful number, since it uses less digits than its factorization.

257081421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21115.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 257081421 is about 16033.7587919988. The cubic root of 257081421 is about 635.8532527020.

The spelling of 257081421 in words is "two hundred fifty-seven million, eighty-one thousand, four hundred twenty-one".