257984211045421 has 4 divisors (see below), whose sum is σ = 294839098337632. Its totient is φ = 221129323753212.

The previous prime is 257984211045413. The next prime is 257984211045443. The reversal of 257984211045421 is 124540112489752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 257984211045421 - 2³ = 257984211045413 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 (257984211045481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18427443646095 + ... + 18427443646108.

It is an arithmetic number, because the mean of its divisors is an integer number (73709774584408).

Almost surely, 2^{257984211045421} is an apocalyptic number.

It is an amenable number.

257984211045421 is a deficient number, since it is larger than the sum of its proper divisors (36854887292211).

257984211045421 is an equidigital number, since it uses as much as digits as its factorization.

257984211045421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36854887292210.

The product of its (nonzero) digits is 6451200, while the sum is 55.

The spelling of 257984211045421 in words is "two hundred fifty-seven trillion, nine hundred eighty-four billion, two hundred eleven million, forty-five thousand, four hundred twenty-one".