21744906512 has 40 divisors (see below), whose sum is σ = 49450781376. Its totient is φ = 9067372416.

The previous prime is 21744906503. The next prime is 21744906541. The reversal of 21744906512 is 21560944712.

It is a super-2 number, since 2×21744906512² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21744906512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2619518 + ... + 2627805.

Almost surely, 2^21744906512 is an apocalyptic number.

It is an amenable number.

21744906512 is an abundant number, since it is smaller than the sum of its proper divisors (27705874864).

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

21744906512 is a wasteful number, since it uses less digits than its factorization.

21744906512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5247375 (or 5247369 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 21744906512 in words is "twenty-one billion, seven hundred forty-four million, nine hundred six thousand, five hundred twelve".