259869670021 has 4 divisors (see below), whose sum is σ = 279859644652. Its totient is φ = 239879695392.

The previous prime is 259869669977. The next prime is 259869670051. The reversal of 259869670021 is 120076968952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24052597921 + 235817072100 = 155089^2 + 485610^2 .

It is a cyclic number.

It is not a de Polignac number, because 259869670021 - 2¹¹ = 259869667973 is a prime.

It is a super-2 number, since 2×259869670021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259869670051) 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 3 ways as a sum of consecutive naturals, for example, 9994987296 + ... + 9994987321.

It is an arithmetic number, because the mean of its divisors is an integer number (69964911163).

Almost surely, 2^259869670021 is an apocalyptic number.

It is an amenable number.

259869670021 is a deficient number, since it is larger than the sum of its proper divisors (19989974631).

259869670021 is a wasteful number, since it uses less digits than its factorization.

259869670021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19989974630.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 259869670021 in words is "two hundred fifty-nine billion, eight hundred sixty-nine million, six hundred seventy thousand, twenty-one".