21110534208 has 168 divisors, whose sum is σ = 62706300800. Its totient is φ = 6785565696.

The previous prime is 21110534201. The next prime is 21110534213. The reversal of 21110534208 is 80243501112.

21110534208 is a `hidden beast` number, since 211 + 105 + 342 + 0 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (21110534201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1951278 + ... + 1962066.

Almost surely, 2^21110534208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110534208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31353150400).

21110534208 is an abundant number, since it is smaller than the sum of its proper divisors (41595766592).

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

21110534208 is a wasteful number, since it uses less digits than its factorization.

21110534208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10929 (or 10916 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 21110534208 in words is "twenty-one billion, one hundred ten million, five hundred thirty-four thousand, two hundred eight".