21166552108 has 24 divisors (see below), whose sum is σ = 40263631632. Its totient is φ = 9677874624.

The previous prime is 21166552061. The next prime is 21166552133. The reversal of 21166552108 is 80125566112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1896535 + ... + 1907662.

It is an arithmetic number, because the mean of its divisors is an integer number (1677651318).

Almost surely, 2^21166552108 is an apocalyptic number.

It is an amenable number.

21166552108 is a deficient number, since it is larger than the sum of its proper divisors (19097079524).

21166552108 is a wasteful number, since it uses less digits than its factorization.

21166552108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804321 (or 3804319 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 21166552108 in words is "twenty-one billion, one hundred sixty-six million, five hundred fifty-two thousand, one hundred eight".