21544811901344 has 12 divisors (see below), whose sum is σ = 42416348430834. Its totient is φ = 10772405950656.

The previous prime is 21544811901337. The next prime is 21544811901373. The reversal of 21544811901344 is 44310911844512.

It can be written as a sum of positive squares in only one way, i.e., 18209849290000 + 3334962611344 = 4267300^2 + 1826188^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336637685927 + ... + 336637685990.

Almost surely, 2^{21544811901344} is an apocalyptic number.

It is an amenable number.

21544811901344 is a deficient number, since it is larger than the sum of its proper divisors (20871536529490).

21544811901344 is an equidigital number, since it uses as much as digits as its factorization.

21544811901344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673275371927 (or 673275371919 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 21544811901344 in words is "twenty-one trillion, five hundred forty-four billion, eight hundred eleven million, nine hundred one thousand, three hundred forty-four".