21802502689 has 16 divisors (see below), whose sum is σ = 23933214720. Its totient is φ = 19696718160.

The previous prime is 21802502639. The next prime is 21802502773. The reversal of 21802502689 is 98620520812.

It is a cyclic number.

It is not a de Polignac number, because 21802502689 - 2²³ = 21794114081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21802502639) 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, 4216984 + ... + 4222150.

It is an arithmetic number, because the mean of its divisors is an integer number (1495825920).

Almost surely, 2^21802502689 is an apocalyptic number.

It is an amenable number.

21802502689 is a deficient number, since it is larger than the sum of its proper divisors (2130712031).

21802502689 is a wasteful number, since it uses less digits than its factorization.

21802502689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7500.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 21802502689 in words is "twenty-one billion, eight hundred two million, five hundred two thousand, six hundred eighty-nine".