21905822924 has 12 divisors (see below), whose sum is σ = 39270195048. Its totient is φ = 10685767200.

The previous prime is 21905822867. The next prime is 21905822929. The reversal of 21905822924 is 42922850912.

It is not an unprimeable number, because it can be changed into a prime (21905822929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66785882 + ... + 66786209.

It is an arithmetic number, because the mean of its divisors is an integer number (3272516254).

Almost surely, 2^21905822924 is an apocalyptic number.

It is an amenable number.

21905822924 is a deficient number, since it is larger than the sum of its proper divisors (17364372124).

21905822924 is a wasteful number, since it uses less digits than its factorization.

21905822924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133572136 (or 133572134 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 21905822924 in words is "twenty-one billion, nine hundred five million, eight hundred twenty-two thousand, nine hundred twenty-four".