21836544837584 has 10 divisors (see below), whose sum is σ = 42308305622850. Its totient is φ = 10918272418784.

The previous prime is 21836544837577. The next prime is 21836544837649. The reversal of 21836544837584 is 48573844563812.

It can be written as a sum of positive squares in only one way, i.e., 20701408014400 + 1135136823184 = 4549880^2 + 1065428^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682392026159 + ... + 682392026190.

It is an arithmetic number, because the mean of its divisors is an integer number (4230830562285).

Almost surely, 2^{21836544837584} is an apocalyptic number.

It is an amenable number.

21836544837584 is a deficient number, since it is larger than the sum of its proper divisors (20471760785266).

21836544837584 is a wasteful number, since it uses less digits than its factorization.

21836544837584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364784052357 (or 1364784052351 counting only the distinct ones).

The product of its digits is 619315200, while the sum is 68.

The spelling of 21836544837584 in words is "twenty-one trillion, eight hundred thirty-six billion, five hundred forty-four million, eight hundred thirty-seven thousand, five hundred eighty-four".