21885654436 has 6 divisors (see below), whose sum is σ = 38299895270. Its totient is φ = 10942827216.

The previous prime is 21885654419. The next prime is 21885654451. The reversal of 21885654436 is 63445658812.

It can be written as a sum of positive squares in only one way, i.e., 21830062500 + 55591936 = 147750^2 + 7456^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2735706801 + ... + 2735706808.

Almost surely, 2^21885654436 is an apocalyptic number.

It is an amenable number.

21885654436 is a deficient number, since it is larger than the sum of its proper divisors (16414240834).

21885654436 is a wasteful number, since it uses less digits than its factorization.

21885654436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5471413613 (or 5471413611 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 52.

The spelling of 21885654436 in words is "twenty-one billion, eight hundred eighty-five million, six hundred fifty-four thousand, four hundred thirty-six".