21054447232 has 192 divisors, whose sum is σ = 54967636800. Its totient is φ = 7838318592.

The previous prime is 21054447203. The next prime is 21054447233. The reversal of 21054447232 is 23274445012.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (21054447233) 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 23 ways as a sum of consecutive naturals, for example, 2570119 + ... + 2578297.

It is an arithmetic number, because the mean of its divisors is an integer number (286289775).

Almost surely, 2^21054447232 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 21054447232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27483818400).

21054447232 is an abundant number, since it is smaller than the sum of its proper divisors (33913189568).

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

21054447232 is a wasteful number, since it uses less digits than its factorization.

21054447232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8243 (or 8218 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 34.

The spelling of 21054447232 in words is "twenty-one billion, fifty-four million, four hundred forty-seven thousand, two hundred thirty-two".