21444633066625 has 16 divisors (see below), whose sum is σ = 26764409812608. Its totient is φ = 17154739950000.

The previous prime is 21444633066611. The next prime is 21444633066641. The reversal of 21444633066625 is 52666033644412.

It is not a de Polignac number, because 21444633066625 - 2⁴³ = 12648540044417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2600751 + ... + 7046500.

It is an arithmetic number, because the mean of its divisors is an integer number (1672775613288).

Almost surely, 2^{21444633066625} is an apocalyptic number.

21444633066625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21444633066625 is a deficient number, since it is larger than the sum of its proper divisors (5319776745983).

21444633066625 is an equidigital number, since it uses as much as digits as its factorization.

21444633066625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9665049 (or 9665039 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 52.

The spelling of 21444633066625 in words is "twenty-one trillion, four hundred forty-four billion, six hundred thirty-three million, sixty-six thousand, six hundred twenty-five".