21918277665296 has 10 divisors (see below), whose sum is σ = 42466662976542. Its totient is φ = 10959138832640.

The previous prime is 21918277665293. The next prime is 21918277665311. The reversal of 21918277665296 is 69256677281912.

It can be written as a sum of positive squares in only one way, i.e., 19763359360000 + 2154918305296 = 4445600^2 + 1467964^2 .

It is not an unprimeable number, because it can be changed into a prime (21918277665293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684946177025 + ... + 684946177056.

Almost surely, 2^{21918277665296} is an apocalyptic number.

It is an amenable number.

21918277665296 is a deficient number, since it is larger than the sum of its proper divisors (20548385311246).

21918277665296 is a wasteful number, since it uses less digits than its factorization.

21918277665296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369892354089 (or 1369892354083 counting only the distinct ones).

The product of its digits is 274337280, while the sum is 71.

The spelling of 21918277665296 in words is "twenty-one trillion, nine hundred eighteen billion, two hundred seventy-seven million, six hundred sixty-five thousand, two hundred ninety-six".