21775600044 has 36 divisors (see below), whose sum is σ = 60047867880. Its totient is φ = 6598666560.

The previous prime is 21775600013. The next prime is 21775600051. The reversal of 21775600044 is 44000657712.

21775600044 is a `hidden beast` number, since 2 + 1 + 7 + 7 + 5 + 600 + 0 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21775599981 and 21775600008.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 27494049 + ... + 27494840.

It is an arithmetic number, because the mean of its divisors is an integer number (1667996330).

Almost surely, 2^21775600044 is an apocalyptic number.

It is an amenable number.

21775600044 is an abundant number, since it is smaller than the sum of its proper divisors (38272267836).

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

21775600044 is a wasteful number, since it uses less digits than its factorization.

21775600044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54988910 (or 54988905 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The spelling of 21775600044 in words is "twenty-one billion, seven hundred seventy-five million, six hundred thousand, forty-four".