21108141648 has 80 divisors (see below), whose sum is σ = 66096216000. Its totient is φ = 6396405120.

The previous prime is 21108141631. The next prime is 21108141653. The reversal of 21108141648 is 84614180112.

21108141648 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 8 + 1 + 4 + 1 + 648 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2216223 + ... + 2225726.

It is an arithmetic number, because the mean of its divisors is an integer number (826202700).

Almost surely, 2^21108141648 is an apocalyptic number.

It is an amenable number.

21108141648 is an abundant number, since it is smaller than the sum of its proper divisors (44988074352).

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

21108141648 is a wasteful number, since it uses less digits than its factorization.

21108141648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441977 (or 4441965 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The spelling of 21108141648 in words is "twenty-one billion, one hundred eight million, one hundred forty-one thousand, six hundred forty-eight".