21802776689 has 8 divisors (see below), whose sum is σ = 22025256960. Its totient is φ = 21581090496.

The previous prime is 21802776661. The next prime is 21802776707. The reversal of 21802776689 is 98667720812.

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-21802776689 is a prime.

It is a super-2 number, since 2×21802776689² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21802776649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143249 + ... + 253230.

It is an arithmetic number, because the mean of its divisors is an integer number (2753157120).

Almost surely, 2^21802776689 is an apocalyptic number.

It is an amenable number.

21802776689 is a deficient number, since it is larger than the sum of its proper divisors (222480271).

21802776689 is a wasteful number, since it uses less digits than its factorization.

21802776689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397039.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 21802776689 in words is "twenty-one billion, eight hundred two million, seven hundred seventy-six thousand, six hundred eighty-nine".