21694668216 has 32 divisors (see below), whose sum is σ = 58408722960. Its totient is φ = 6675282432.

The previous prime is 21694668199. The next prime is 21694668221. The reversal of 21694668216 is 61286649612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34766785 + ... + 34767408.

Almost surely, 2^21694668216 is an apocalyptic number.

21694668216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21694668216 is an abundant number, since it is smaller than the sum of its proper divisors (36714054744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21694668216 is a wasteful number, since it uses less digits than its factorization.

21694668216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69534215 (or 69534211 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 51.

The spelling of 21694668216 in words is "twenty-one billion, six hundred ninety-four million, six hundred sixty-eight thousand, two hundred sixteen".