21935394016 has 12 divisors (see below), whose sum is σ = 43185307032. Its totient is φ = 10967696992.

The previous prime is 21935393993. The next prime is 21935394059. The reversal of 21935394016 is 61049353912.

It is a happy number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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 as a sum of consecutive naturals, namely, 342740500 + ... + 342740563.

It is an arithmetic number, because the mean of its divisors is an integer number (3598775586).

Almost surely, 2^21935394016 is an apocalyptic number.

It is an amenable number.

21935394016 is a deficient number, since it is larger than the sum of its proper divisors (21249913016).

21935394016 is an equidigital number, since it uses as much as digits as its factorization.

21935394016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685481073 (or 685481065 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 21935394016 in words is "twenty-one billion, nine hundred thirty-five million, three hundred ninety-four thousand, sixteen".