21944387187072 has 192 divisors, whose sum is σ = 75966629107200. Its totient is φ = 5939834084352.

The previous prime is 21944387187017. The next prime is 21944387187083. The reversal of 21944387187072 is 27078178344912.

21944387187072 is a `hidden beast` number, since 2 + 1 + 9 + 4 + 4 + 387 + 187 + 0 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×21944387187072² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71459368 + ... + 71765799.

It is an arithmetic number, because the mean of its divisors is an integer number (395659526600).

Almost surely, 2^{21944387187072} is an apocalyptic number.

It is an amenable number.

21944387187072 is an abundant number, since it is smaller than the sum of its proper divisors (54022241920128).

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

21944387187072 is a wasteful number, since it uses less digits than its factorization.

21944387187072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143225213 (or 143225198 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 63.

The spelling of 21944387187072 in words is "twenty-one trillion, nine hundred forty-four billion, three hundred eighty-seven million, one hundred eighty-seven thousand, seventy-two".