21129960259 has 8 divisors (see below), whose sum is σ = 21704072400. Its totient is φ = 20556007776.

The previous prime is 21129960253. The next prime is 21129960283. The reversal of 21129960259 is 95206992112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21129960259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21129960253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258192 + ... + 330034.

It is an arithmetic number, because the mean of its divisors is an integer number (2713009050).

Almost surely, 2^21129960259 is an apocalyptic number.

21129960259 is a deficient number, since it is larger than the sum of its proper divisors (574112141).

21129960259 is an equidigital number, since it uses as much as digits as its factorization.

21129960259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79829.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 21129960259 in words is "twenty-one billion, one hundred twenty-nine million, nine hundred sixty thousand, two hundred fifty-nine".