21224626752 has 168 divisors, whose sum is σ = 69168471264. Its totient is φ = 5707419648.

The previous prime is 21224626739. The next prime is 21224626853. The reversal of 21224626752 is 25762642212.

It is a tau number, because it is divible by the number of its divisors (168).

It is a self number, because there is not a number n which added to its sum of digits gives 21224626752.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93583 + ... + 226289.

Almost surely, 2^21224626752 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21224626752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34584235632).

21224626752 is an abundant number, since it is smaller than the sum of its proper divisors (47943844512).

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

21224626752 is a wasteful number, since it uses less digits than its factorization.

21224626752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132753 (or 132736 counting only the distinct ones).

The product of its digits is 161280, while the sum is 39.

The spelling of 21224626752 in words is "twenty-one billion, two hundred twenty-four million, six hundred twenty-six thousand, seven hundred fifty-two".