21834776769 has 32 divisors (see below), whose sum is σ = 31689001344. Its totient is φ = 13293020160.

The previous prime is 21834776767. The next prime is 21834776779. The reversal of 21834776769 is 96767743812.

It is not a de Polignac number, because 21834776769 - 2¹ = 21834776767 is a prime.

It is a super-2 number, since 2×21834776769² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21834776767) 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, 2512059 + ... + 2520735.

It is an arithmetic number, because the mean of its divisors is an integer number (990281292).

Almost surely, 2^21834776769 is an apocalyptic number.

It is an amenable number.

21834776769 is a deficient number, since it is larger than the sum of its proper divisors (9854224575).

21834776769 is a wasteful number, since it uses less digits than its factorization.

21834776769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9377.

The product of its digits is 21337344, while the sum is 60.

The spelling of 21834776769 in words is "twenty-one billion, eight hundred thirty-four million, seven hundred seventy-six thousand, seven hundred sixty-nine".