21444633066624 has 64 divisors (see below), whose sum is σ = 56966803703040. Its totient is φ = 7147646678016.

The previous prime is 21444633066611. The next prime is 21444633066641. The reversal of 21444633066624 is 42666033644412.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2679834 + ... + 7076070.

It is an arithmetic number, because the mean of its divisors is an integer number (890106307860).

Almost surely, 2^{21444633066624} is an apocalyptic number.

21444633066624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21444633066624 is an abundant number, since it is smaller than the sum of its proper divisors (35522170636416).

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

21444633066624 is a wasteful number, since it uses less digits than its factorization.

21444633066624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4408957 (or 4408945 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 51.

The spelling of 21444633066624 in words is "twenty-one trillion, four hundred forty-four billion, six hundred thirty-three million, sixty-six thousand, six hundred twenty-four".