21066170552 has 96 divisors (see below), whose sum is σ = 47120144400. Its totient is φ = 8800856064.

The previous prime is 21066170527. The next prime is 21066170597. The reversal of 21066170552 is 25507166012.

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, 2543474 + ... + 2551742.

Almost surely, 2^21066170552 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 21066170552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23560072200).

21066170552 is an abundant number, since it is smaller than the sum of its proper divisors (26053973848).

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

21066170552 is a wasteful number, since it uses less digits than its factorization.

21066170552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8453 (or 8442 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 21066170552 in words is "twenty-one billion, sixty-six million, one hundred seventy thousand, five hundred fifty-two".