21298569859 has 18 divisors (see below), whose sum is σ = 26085335220. Its totient is φ = 17291463336.

The previous prime is 21298569857. The next prime is 21298569883. The reversal of 21298569859 is 95896589212.

It is not a de Polignac number, because 21298569859 - 2¹ = 21298569857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21298569859.

It is not an unprimeable number, because it can be changed into a prime (21298569857) 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 17 ways as a sum of consecutive naturals, for example, 4450582 + ... + 4455364.

It is an arithmetic number, because the mean of its divisors is an integer number (1449185290).

Almost surely, 2^21298569859 is an apocalyptic number.

21298569859 is a deficient number, since it is larger than the sum of its proper divisors (4786765361).

21298569859 is an frugal number, since it uses more digits than its factorization.

21298569859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9599 (or 4809 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 64.

The spelling of 21298569859 in words is "twenty-one billion, two hundred ninety-eight million, five hundred sixty-nine thousand, eight hundred fifty-nine".