21997968112 has 20 divisors (see below), whose sum is σ = 42661648696. Its totient is φ = 10988510400.

The previous prime is 21997968073. The next prime is 21997968119. The reversal of 21997968112 is 21186979912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21997968119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637263 + ... + 670894.

Almost surely, 2^21997968112 is an apocalyptic number.

It is an amenable number.

21997968112 is a deficient number, since it is larger than the sum of its proper divisors (20663680584).

21997968112 is a wasteful number, since it uses less digits than its factorization.

21997968112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309216 (or 1309210 counting only the distinct ones).

The product of its digits is 979776, while the sum is 55.

The spelling of 21997968112 in words is "twenty-one billion, nine hundred ninety-seven million, nine hundred sixty-eight thousand, one hundred twelve".