21668854088432 has 20 divisors (see below), whose sum is σ = 42234802435056. Its totient is φ = 10769550234240.

The previous prime is 21668854088411. The next prime is 21668854088437. The reversal of 21668854088432 is 23488045886612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21668854088437) 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, 4054797869 + ... + 4054803212.

Almost surely, 2^{21668854088432} is an apocalyptic number.

It is an amenable number.

21668854088432 is a deficient number, since it is larger than the sum of its proper divisors (20565948346624).

21668854088432 is a wasteful number, since it uses less digits than its factorization.

21668854088432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8109601256 (or 8109601250 counting only the distinct ones).

The product of its (nonzero) digits is 141557760, while the sum is 65.

The spelling of 21668854088432 in words is "twenty-one trillion, six hundred sixty-eight billion, eight hundred fifty-four million, eighty-eight thousand, four hundred thirty-two".