21836727969 has 32 divisors (see below), whose sum is σ = 34969144320. Its totient is φ = 11858519232.

The previous prime is 21836727959. The next prime is 21836728007. The reversal of 21836727969 is 96972763812.

It is not a de Polignac number, because 21836727969 - 2⁵ = 21836727937 is a prime.

It is a super-2 number, since 2×21836727969² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21836727959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293379 + ... + 360200.

It is an arithmetic number, because the mean of its divisors is an integer number (1092785760).

Almost surely, 2^21836727969 is an apocalyptic number.

It is an amenable number.

21836727969 is a deficient number, since it is larger than the sum of its proper divisors (13132416351).

21836727969 is a wasteful number, since it uses less digits than its factorization.

21836727969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653669.

The product of its digits is 13716864, while the sum is 60.

The spelling of 21836727969 in words is "twenty-one billion, eight hundred thirty-six million, seven hundred twenty-seven thousand, nine hundred sixty-nine".