259128250821 has 16 divisors (see below), whose sum is σ = 418793133120. Its totient is φ = 157047424560.

The previous prime is 259128250817. The next prime is 259128250859. The reversal of 259128250821 is 128052821952.

259128250821 is a `hidden beast` number, since 2 + 59 + 12 + 82 + 508 + 2 + 1 = 666.

It is not a de Polignac number, because 259128250821 - 2² = 259128250817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259128250861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436242550 + ... + 436243143.

It is an arithmetic number, because the mean of its divisors is an integer number (26174570820).

Almost surely, 2^259128250821 is an apocalyptic number.

It is an amenable number.

259128250821 is a deficient number, since it is larger than the sum of its proper divisors (159664882299).

259128250821 is a wasteful number, since it uses less digits than its factorization.

259128250821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872485713 (or 872485707 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 259128250821 in words is "two hundred fifty-nine billion, one hundred twenty-eight million, two hundred fifty thousand, eight hundred twenty-one".