21924749012 has 48 divisors (see below), whose sum is σ = 40655260800. Its totient is φ = 10327820160.

The previous prime is 21924749009. The next prime is 21924749017. The reversal of 21924749012 is 21094742912.

It is a super-2 number, since 2×21924749012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21924749017) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7535414 + ... + 7538322.

It is an arithmetic number, because the mean of its divisors is an integer number (846984600).

Almost surely, 2^21924749012 is an apocalyptic number.

It is an amenable number.

21924749012 is a deficient number, since it is larger than the sum of its proper divisors (18730511788).

21924749012 is a wasteful number, since it uses less digits than its factorization.

21924749012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496 (or 4494 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21924749012 in words is "twenty-one billion, nine hundred twenty-four million, seven hundred forty-nine thousand, twelve".